diff --git a/libc/Android.mk b/libc/Android.mk
index 46641d5..06d36fe 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -140,6 +140,10 @@
 	stdio/vsscanf.c \
 	stdio/wbuf.c \
 	stdio/wsetup.c \
+	stdio/__snprintf_chk.c \
+	stdio/__sprintf_chk.c \
+	stdio/__vsnprintf_chk.c \
+	stdio/__vsprintf_chk.c \
 	stdlib/_rand48.c \
 	stdlib/assert.c \
 	stdlib/atexit.c \
@@ -205,6 +209,15 @@
 	string/strtok.c \
 	string/strtotimeval.c \
 	string/strxfrm.c \
+	string/__memcpy_chk.c \
+	string/__memmove_chk.c \
+	string/__memset_chk.c \
+	string/__strcat_chk.c \
+	string/__strcpy_chk.c \
+	string/__strlcat_chk.c \
+	string/__strlcpy_chk.c \
+	string/__strncat_chk.c \
+	string/__strncpy_chk.c \
 	wchar/wcpcpy.c \
 	wchar/wcpncpy.c \
 	wchar/wcscasecmp.c \
@@ -516,8 +529,8 @@
     libc_common_cflags += -DANDROID_SMP=0
 endif
 
-# Needed to access private/__dso_handle.S from
-# crtbegin_xxx.S and crtend_xxx.S
+# Needed to access private/__dso_handle.h from
+# crtbegin_xxx.c and crtend_xxx.c
 #
 libc_crt_target_cflags += -I$(LOCAL_PATH)/private
 
@@ -530,11 +543,11 @@
 libc_common_c_includes := \
 		$(LOCAL_PATH)/stdlib  \
 		$(LOCAL_PATH)/string  \
-		$(LOCAL_PATH)/stdio
+		$(LOCAL_PATH)/stdio   \
+		external/safe-iop/include
 
-# Needed to access private/__dso_handle.S from
+# Needed to access private/__dso_handle.h from
 # crtbegin_xxx.S and crtend_xxx.S
-# and machine/asm.h
 #
 libc_crt_target_cflags += -I$(LOCAL_PATH)/private -I$(LOCAL_PATH)/arch-$(TARGET_ARCH)/include
 
@@ -556,17 +569,21 @@
 #
 
 libc_crt_target_so_cflags := $(libc_crt_target_cflags)
+libc_crt_target_crtstart_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin.c
+libc_crt_target_crtstart_so_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_so.c
 ifeq ($(TARGET_ARCH),x86)
     # This flag must be added for x86 targets, but not for ARM
     libc_crt_target_so_cflags += -fPIC
+    libc_crt_target_crtstart_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin.S
+    libc_crt_target_crtstart_so_file := $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_so.S
 endif
-GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_so.o
-$(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_so.S
+GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
+$(GEN): $(libc_crt_target_crtstart_so_file)
 	@mkdir -p $(dir $@)
 	$(TARGET_CC) $(libc_crt_target_so_cflags) -o $@ -c $<
 ALL_GENERATED_SOURCES += $(GEN)
 
-GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_so.o
+GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
 $(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtend_so.S
 	@mkdir -p $(dir $@)
 	$(TARGET_CC) $(libc_crt_target_so_cflags) -o $@ -c $<
@@ -574,14 +591,14 @@
 endif # TARGET_ARCH == x86 || TARGET_ARCH == arm
 
 
-GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_static.o
-$(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_static.S
+GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
+$(GEN): $(libc_crt_target_crtstart_file)
 	@mkdir -p $(dir $@)
 	$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
 ALL_GENERATED_SOURCES += $(GEN)
 
-GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_dynamic.o
-$(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtbegin_dynamic.S
+GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
+$(GEN): $(libc_crt_target_crtstart_file)
 	@mkdir -p $(dir $@)
 	$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
 ALL_GENERATED_SOURCES += $(GEN)
@@ -589,7 +606,7 @@
 
 # We rename crtend.o to crtend_android.o to avoid a
 # name clash between gcc and bionic.
-GEN := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_android.o
+GEN := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
 $(GEN): $(LOCAL_PATH)/arch-$(TARGET_ARCH)/bionic/crtend.S
 	@mkdir -p $(dir $@)
 	$(TARGET_CC) $(libc_crt_target_cflags) -o $@ -c $<
@@ -679,12 +696,6 @@
 # see libc/bionic/pthread_debug.c for details
 
 LOCAL_CFLAGS := $(libc_common_cflags) -DPTHREAD_DEBUG -DPTHREAD_DEBUG_ENABLED=0
-
-ifeq ($(TARGET_ARCH),arm)
-# TODO: At some point, we need to remove this custom linker script.
-LOCAL_LDFLAGS := -Wl,-T,$(BUILD_SYSTEM)/armelf.xsc
-endif
-
 LOCAL_C_INCLUDES := $(libc_common_c_includes)
 
 LOCAL_SRC_FILES := \
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/arch-arm/bionic/atexit.h
similarity index 61%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/arch-arm/bionic/atexit.h
index beea685..d567bfc 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/arch-arm/bionic/atexit.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,28 @@
  * SUCH DAMAGE.
  */
 
+/* CRT_LEGACY_WORKAROUND should only be defined when building
+ * this file as part of the platform's C library.
+ *
+ * The C library already defines a function named 'atexit()'
+ * for backwards compatibility with older NDK-generated binaries.
+ *
+ * For newer ones, 'atexit' is actually embedded in the C
+ * runtime objects that are linked into the final ELF
+ * binary (shared library or executable), and will call
+ * __cxa_atexit() in order to un-register any atexit()
+ * handler when a library is unloaded.
+ *
+ * This function must be global *and* hidden. Only the
+ * code inside the same ELF binary should be able to access it.
+ */
+
 #ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
+extern void *__dso_handle;
+
+__attribute__ ((visibility ("hidden")))
+int atexit(void (*func)(void))
+{
+  return (__cxa_atexit((void (*)(void *))func, (void *)0, &__dso_handle));
+}
 #endif
diff --git a/libc/arch-arm/bionic/crtbegin.c b/libc/arch-arm/bionic/crtbegin.c
new file mode 100644
index 0000000..9dcd254
--- /dev/null
+++ b/libc/arch-arm/bionic/crtbegin.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+typedef struct
+{
+    void (**preinit_array)(void);
+    void (**init_array)(void);
+    void (**fini_array)(void);
+    void (**ctors_array)(void);
+} structors_array_t;
+
+extern int main(int argc, char **argv, char **env);
+
+extern void __libc_init(
+  unsigned int *elfdata,
+  void (*onexit)(void),
+  int (*slingshot)(int, char**, char**),
+  structors_array_t const * const structors
+);
+
+__attribute__ ((section (".preinit_array")))
+void (*__PREINIT_ARRAY__)(void) = (void (*)(void)) -1;
+
+__attribute__ ((section (".init_array")))
+void (*__INIT_ARRAY__)(void) = (void (*)(void)) -1;
+
+__attribute__ ((section (".fini_array")))
+void (*__FINI_ARRAY__)(void) = (void (*)(void)) -1;
+
+__attribute__ ((section (".ctors")))
+void (*__CTOR_LIST__)(void) = (void (*)(void)) -1;
+
+__attribute__((visbility("hidden")))
+void _start() {
+  structors_array_t array;
+  void *elfdata;
+
+  array.preinit_array = &__PREINIT_ARRAY__;
+  array.init_array =    &__INIT_ARRAY__;
+  array.fini_array =    &__FINI_ARRAY__;
+  array.ctors_array =   &__CTOR_LIST__;
+
+  elfdata = __builtin_frame_address(0) + sizeof(void *);
+  __libc_init(elfdata, (void *) 0, &main, &array);
+}
+
+#include "__dso_handle.h"
+#include "atexit.h"
diff --git a/libc/arch-arm/bionic/crtbegin_dynamic.S b/libc/arch-arm/bionic/crtbegin_dynamic.S
deleted file mode 100644
index ec6d482..0000000
--- a/libc/arch-arm/bionic/crtbegin_dynamic.S
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-	.text
-	.align 4
-	.type _start,#function
-	.globl _start
-
-# this is the small startup code that is first run when
-# any executable that is dynamically-linked with Bionic
-# runs.
-#
-# it's purpose is to call __libc_init with appropriate
-# arguments, which are:
-#
-#    - the address of the raw data block setup by the Linux
-#      kernel ELF loader
-#
-#    - address of an "onexit" function, not used on any
-#      platform supported by Bionic
-#
-#    - address of the "main" function of the program.
-#
-#    - address of the constructor list
-#
-_start:	
-	mov	r0, sp
-	mov	r1, #0
-	ldr	r2, =main
-	adr	r3, 1f
-	ldr	r4, =__libc_init
-	blx	r4
-	mov	r0, #0
-	bx	r0
-
-1:  .long   __PREINIT_ARRAY__
-    .long   __INIT_ARRAY__
-    .long   __FINI_ARRAY__
-    .long   __CTOR_LIST__
-
-	.section .preinit_array, "aw"
-	.globl __PREINIT_ARRAY__
-__PREINIT_ARRAY__:
-	.long -1
-
-	.section .init_array, "aw"
-	.globl __INIT_ARRAY__
-__INIT_ARRAY__:
-	.long -1
-
-	.section .fini_array, "aw"
-	.globl __FINI_ARRAY__
-__FINI_ARRAY__:
-	.long -1
-
-	.section .ctors, "aw"
-	.globl __CTOR_LIST__
-__CTOR_LIST__:
-	.long -1
-
-#include "__dso_handle.S"
-#include "atexit.S"
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/arch-arm/bionic/crtbegin_so.c
similarity index 69%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/arch-arm/bionic/crtbegin_so.c
index beea685..57d19bf 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/arch-arm/bionic/crtbegin_so.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,18 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
+extern void __cxa_finalize(void *);
+extern void *__dso_handle;
+
+__attribute__((visbility("hidden")))
+void __on_dlclose() {
+  __cxa_finalize(&__dso_handle);
+}
+
+#ifdef CRT_LEGACY_WORKAROUND
+#include "__dso_handle.h"
+#else
+#include "__dso_handle_so.h"
 #endif
+
+#include "atexit.h"
diff --git a/libc/arch-arm/bionic/crtbegin_static.S b/libc/arch-arm/bionic/crtbegin_static.S
deleted file mode 100644
index 087ce36..0000000
--- a/libc/arch-arm/bionic/crtbegin_static.S
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-	.text
-	.align 4
-	.type _start,#function
-	.globl _start
-
-# this is the small startup code that is first run when
-# any executable that is statically-linked with Bionic
-# runs.
-#
-# it's purpose is to call __libc_init with appropriate
-# arguments, which are:
-#
-#    - the address of the raw data block setup by the Linux
-#      kernel ELF loader
-#
-#    - address of an "onexit" function, not used on any
-#      platform supported by Bionic
-#
-#    - address of the "main" function of the program.
-#
-#    - address of the constructor list
-#
-_start:	
-	mov	r0, sp
-	mov	r1, #0
-	ldr	r2, =main
-	adr	r3, 1f
-	ldr	r4, =__libc_init
-	blx	r4
-	mov	r0, #0
-	bx	r0
-
-1:  .long   __PREINIT_ARRAY__
-    .long   __INIT_ARRAY__
-    .long   __FINI_ARRAY__
-    .long   __CTOR_LIST__
-
-	.section .preinit_array, "aw"
-	.globl __PREINIT_ARRAY__
-__PREINIT_ARRAY__:
-	.long -1
-
-	.section .init_array, "aw"
-	.globl __INIT_ARRAY__
-__INIT_ARRAY__:
-	.long -1
-
-	.section .fini_array, "aw"
-	.globl __FINI_ARRAY__
-__FINI_ARRAY__:
-	.long -1
-
-	.section .ctors, "aw"
-	.globl __CTOR_LIST__
-__CTOR_LIST__:
-	.long -1
-
-
-#include "__dso_handle.S"
-#include "atexit.S"
diff --git a/libc/private/__dso_handle.S b/libc/arch-x86/bionic/__dso_handle.S
similarity index 100%
rename from libc/private/__dso_handle.S
rename to libc/arch-x86/bionic/__dso_handle.S
diff --git a/libc/private/__dso_handle_so.S b/libc/arch-x86/bionic/__dso_handle_so.S
similarity index 100%
rename from libc/private/__dso_handle_so.S
rename to libc/arch-x86/bionic/__dso_handle_so.S
diff --git a/libc/arch-x86/bionic/crtbegin_dynamic.S b/libc/arch-x86/bionic/crtbegin.S
similarity index 97%
rename from libc/arch-x86/bionic/crtbegin_dynamic.S
rename to libc/arch-x86/bionic/crtbegin.S
index 177244b..39b6af0 100644
--- a/libc/arch-x86/bionic/crtbegin_dynamic.S
+++ b/libc/arch-x86/bionic/crtbegin.S
@@ -30,8 +30,7 @@
 	.globl _start
 
 # this is the small startup code that is first run when
-# any executable that is dynamically-linked with Bionic
-# runs.
+# any executable that is linked with Bionic runs.
 #
 # it's purpose is to call __libc_init with appropriate
 # arguments, which are:
diff --git a/libc/arch-x86/bionic/crtbegin_static.S b/libc/arch-x86/bionic/crtbegin_static.S
deleted file mode 100644
index 4fffecd..0000000
--- a/libc/arch-x86/bionic/crtbegin_static.S
+++ /dev/null
@@ -1,138 +0,0 @@
-# bionic/arch-x86/bionic/crtbegin_static.S
-#
-# Copyright 2006, The Android Open Source Project
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are met:
-#     * Redistributions of source code must retain the above copyright
-#       notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above copyright
-#       notice, this list of conditions and the following disclaimer in the
-#       documentation and/or other materials provided with the distribution.
-#     * Neither the name of Google Inc. nor the names of its contributors may
-#       be used to endorse or promote products derived from this software
-#       without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR 
-# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 
-# EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
-# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
-# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
-# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-	.text
-	.align 4
-	.type _start, @function
-	.globl _start
-
-# this is the small startup code that is first run when
-# any executable that is statically-linked with Bionic
-# runs.
-#
-# it's purpose is to call __libc_init with appropriate
-# arguments, which are:
-#
-#    - the address of the raw data block setup by the Linux
-#      kernel ELF loader
-#
-#    - address of an "onexit" function, not used on any
-#      platform supported by Bionic
-#
-#    - address of the "main" function of the program. We
-#      can't hard-code it in the adr pseudo instruction
-#      so we use a tiny trampoline that will get relocated
-#      by the dynamic linker before this code runs
-#
-#    - address of the constructor list
-#
-_start:	
-        mov     %esp, %eax
-        # before push arguments, align the stack to a 16 byte boundary
-        andl    $~15, %esp
-        mov     $1f, %edx
-        pushl   %edx
-        mov     $0f, %edx
-        pushl   %edx
-        mov     $0, %edx
-        pushl   %edx
-        pushl   %eax
-        call    __libc_init
-
-0:  jmp   main
-
-1:  .long   __PREINIT_ARRAY__
-    .long   __INIT_ARRAY__
-    .long   __FINI_ARRAY__
-
-	.section .preinit_array, "aw"
-	.globl __PREINIT_ARRAY__
-__PREINIT_ARRAY__:
-	.long -1
-
-	.section .init_array, "aw"
-	.globl __INIT_ARRAY__
-__INIT_ARRAY__:
-	.long -1
-	.long	frame_dummy
-
-	.section .fini_array, "aw"
-	.globl __FINI_ARRAY__
-__FINI_ARRAY__:
-	.long -1
-	.long	__do_global_dtors_aux
-
-	.section	.eh_frame,"a",@progbits
-	.align 4
-	.type	__EH_FRAME_BEGIN__, @object
-__EH_FRAME_BEGIN__:
-	.text
-	.p2align 4,,15
-	.type	__do_global_dtors_aux, @function
-__do_global_dtors_aux:
-	pushl	%ebp
-	movl	%esp, %ebp
-	subl	$24, %esp
-	cmpb	$0, completed.4454
-	jne	.L4
-	movl	$__deregister_frame_info_bases, %eax
-	testl	%eax, %eax
-	je	.L3
-	movl	$__EH_FRAME_BEGIN__, (%esp)
-	call	__deregister_frame_info_bases
-.L3:
-	movb	$1, completed.4454
-.L4:
-	leave
-	ret
-	.text
-	.p2align 4,,15
-	.type	frame_dummy, @function
-frame_dummy:
-	pushl	%ebp
-	movl	$__register_frame_info_bases, %eax
-	movl	%esp, %ebp
-	subl	$24, %esp
-	testl	%eax, %eax
-	je	.L7
-	movl	%ebx, 12(%esp)
-	movl	$0, 8(%esp)
-	movl	$object.4466, 4(%esp)
-	movl	$__EH_FRAME_BEGIN__, (%esp)
-	call	__register_frame_info_bases
-.L7:
-	leave
-	ret
-	.local	completed.4454
-	.comm	completed.4454,1,1
-	.local	object.4466
-	.comm	object.4466,24,4
-	.weak	__register_frame_info_bases
-	.weak	__deregister_frame_info_bases
-
-#include "__dso_handle.S"
-#include "atexit.S"
-#include "__stack_chk_fail_local.S"
diff --git a/libc/bionic/logd_write.c b/libc/bionic/logd_write.c
index 2bc39fa..ac71689 100644
--- a/libc/bionic/logd_write.c
+++ b/libc/bionic/logd_write.c
@@ -64,6 +64,7 @@
     LOG_ID_NONE = 0,
     LOG_ID_MAIN,
     LOG_ID_RADIO,
+    LOG_ID_EVENTS,
     LOG_ID_MAX
 } log_id_t;
 
@@ -84,7 +85,8 @@
 static log_channel_t log_channels[LOG_ID_MAX] = {
     { __write_to_log_null, -1, NULL },
     { __write_to_log_init, -1, "/dev/"LOGGER_LOG_MAIN },
-    { __write_to_log_init, -1, "/dev/"LOGGER_LOG_RADIO }
+    { __write_to_log_init, -1, "/dev/"LOGGER_LOG_RADIO },
+    { __write_to_log_init, -1, "/dev/"LOGGER_LOG_EVENTS }
 };
 
 /* Important: see technical note at start of source file */
@@ -207,3 +209,41 @@
 
     return -1;
 }
+
+/*
+ * Event logging.
+ */
+
+// must be kept in sync with frameworks/base/core/java/android/util/EventLog.java
+typedef enum {
+    EVENT_TYPE_INT      = 0,
+    EVENT_TYPE_LONG     = 1,
+    EVENT_TYPE_STRING   = 2,
+    EVENT_TYPE_LIST     = 3,
+} AndroidEventLogType;
+
+static int __libc_android_log_btwrite(int32_t tag, char type, const void *payload, size_t len)
+{
+    struct iovec vec[3];
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = &type;
+    vec[1].iov_len = sizeof(type);
+    vec[2].iov_base = (void*)payload;
+    vec[2].iov_len = len;
+
+    return log_channels[LOG_ID_EVENTS].logger(LOG_ID_EVENTS, vec);
+}
+
+__LIBC_HIDDEN__
+void __libc_android_log_event_int(int32_t tag, int value)
+{
+    __libc_android_log_btwrite(tag, EVENT_TYPE_INT, &value, sizeof(value));
+}
+
+__LIBC_HIDDEN__
+void __libc_android_log_event_uid(int32_t tag)
+{
+    __libc_android_log_event_int(tag, getuid());
+}
diff --git a/libc/include/fcntl.h b/libc/include/fcntl.h
index 7219dd7..47151f4 100644
--- a/libc/include/fcntl.h
+++ b/libc/include/fcntl.h
@@ -49,6 +49,46 @@
 extern int  fcntl(int   fd, int   command, ...);
 extern int  creat(const char*  path, mode_t  mode);
 
+#if defined(__BIONIC_FORTIFY_INLINE)
+
+# if !defined(__clang__)
+/*
+ * Clang doesn't have support for __builtin_va_arg_pack()
+ * and __builtin_va_arg_pack_len()
+ *
+ * http://clang.llvm.org/docs/UsersManual.html#c_unimpl_gcc
+ */
+
+extern void __open_creat_error()
+    __attribute__((__error__ ("open called with O_CREAT, but missing mode")));
+extern void __open_toomanyargs_error()
+    __attribute__((__error__ ("open called with too many arguments")));
+extern int __open_real(const char *pathname, int flags, ...)
+    __asm__(__USER_LABEL_PREFIX__ "open");
+extern int __open_2(const char *, int);
+
+__BIONIC_FORTIFY_INLINE
+int open(const char *pathname, int flags, ...) {
+    if (__builtin_constant_p(flags)) {
+        if ((flags & O_CREAT) && __builtin_va_arg_pack_len() == 0) {
+            __open_creat_error();  // compile time error
+        }
+    }
+
+    if (__builtin_va_arg_pack_len() > 1) {
+        __open_toomanyargs_error();  // compile time error
+    }
+
+    if (__builtin_va_arg_pack_len() == 0) {
+        return __open_2(pathname, flags);
+    }
+
+    return __open_real(pathname, flags, __builtin_va_arg_pack());
+}
+
+#endif /* !defined(__clang__) */
+#endif /* defined(__BIONIC_FORTIFY_INLINE) */
+
 __END_DECLS
 
 #endif /* _FCNTL_H */
diff --git a/libc/include/malloc.h b/libc/include/malloc.h
index a864286..bcea672 100644
--- a/libc/include/malloc.h
+++ b/libc/include/malloc.h
@@ -35,7 +35,7 @@
 
 extern __mallocfunc void*  malloc(size_t);
 extern __mallocfunc void*  calloc(size_t, size_t);
-extern __mallocfunc void*  realloc(void *, size_t);
+extern void*  realloc(void *, size_t);
 extern                void   free(void *);
 
 extern void*   memalign(size_t  alignment, size_t  bytesize);
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 8d3d5d7..18b19bf 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -231,12 +231,16 @@
 int	 fgetpos(FILE *, fpos_t *);
 char	*fgets(char *, int, FILE *);
 FILE	*fopen(const char *, const char *);
-int	 fprintf(FILE *, const char *, ...);
+int	 fprintf(FILE *, const char *, ...)
+		__attribute__((__format__ (printf, 2, 3)))
+		__attribute__((__nonnull__ (2)));
 int	 fputc(int, FILE *);
 int	 fputs(const char *, FILE *);
 size_t	 fread(void *, size_t, size_t, FILE *);
 FILE	*freopen(const char *, const char *, FILE *);
-int	 fscanf(FILE *, const char *, ...);
+int	 fscanf(FILE *, const char *, ...)
+		__attribute__ ((__format__ (scanf, 2, 3)))
+		__attribute__ ((__nonnull__ (2)));
 int	 fseek(FILE *, long, int);
 int	 fseeko(FILE *, off_t, int);
 int	 fsetpos(FILE *, const fpos_t *);
@@ -253,24 +257,38 @@
 extern char *sys_errlist[];
 #endif
 void	 perror(const char *);
-int	 printf(const char *, ...);
+int	 printf(const char *, ...)
+		__attribute__((__format__ (printf, 1, 2)))
+		__attribute__((__nonnull__ (1)));
 int	 putc(int, FILE *);
 int	 putchar(int);
 int	 puts(const char *);
 int	 remove(const char *);
 int	 rename(const char *, const char *);
 void	 rewind(FILE *);
-int	 scanf(const char *, ...);
+int	 scanf(const char *, ...)
+		__attribute__ ((__format__ (scanf, 1, 2)))
+		__attribute__ ((__nonnull__ (1)));
 void	 setbuf(FILE *, char *);
 int	 setvbuf(FILE *, char *, int, size_t);
-int	 sprintf(char *, const char *, ...);
-int	 sscanf(const char *, const char *, ...);
+int	 sprintf(char *, const char *, ...)
+		__attribute__((__format__ (printf, 2, 3)))
+		__attribute__((__nonnull__ (2)));
+int	 sscanf(const char *, const char *, ...)
+		__attribute__ ((__format__ (scanf, 2, 3)))
+		__attribute__ ((__nonnull__ (2)));
 FILE	*tmpfile(void);
 char	*tmpnam(char *);
 int	 ungetc(int, FILE *);
-int	 vfprintf(FILE *, const char *, __va_list);
-int	 vprintf(const char *, __va_list);
-int	 vsprintf(char *, const char *, __va_list);
+int	 vfprintf(FILE *, const char *, __va_list)
+		__attribute__((__format__ (printf, 2, 0)))
+		__attribute__((__nonnull__ (2)));
+int	 vprintf(const char *, __va_list)
+		__attribute__((__format__ (printf, 1, 0)))
+		__attribute__((__nonnull__ (1)));
+int	 vsprintf(char *, const char *, __va_list)
+		__attribute__((__format__ (printf, 2, 0)))
+		__attribute__((__nonnull__ (2)));
 
 #if __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE
 int	 snprintf(char *, size_t, const char *, ...)
@@ -453,9 +471,62 @@
  * #define fdprintf dprintf for compatibility
  */
 __BEGIN_DECLS
-int fdprintf(int, const char*, ...);
-int vfdprintf(int, const char*, __va_list);
+int fdprintf(int, const char*, ...)
+		__attribute__((__format__ (printf, 2, 3)))
+		__attribute__((__nonnull__ (2)));
+int vfdprintf(int, const char*, __va_list)
+		__attribute__((__format__ (printf, 2, 0)))
+		__attribute__((__nonnull__ (2)));
 __END_DECLS
 #endif /* _GNU_SOURCE */
 
+#if defined(__BIONIC_FORTIFY_INLINE)
+
+__BIONIC_FORTIFY_INLINE
+__attribute__((__format__ (printf, 3, 0)))
+__attribute__((__nonnull__ (3)))
+int vsnprintf(char *dest, size_t size, const char *format, __va_list ap)
+{
+    return __builtin___vsnprintf_chk(dest, size, 0,
+        __builtin_object_size(dest, 0), format, ap);
+}
+
+__BIONIC_FORTIFY_INLINE
+__attribute__((__format__ (printf, 2, 0)))
+__attribute__((__nonnull__ (2)))
+int vsprintf(char *dest, const char *format, __va_list ap)
+{
+    return __builtin___vsprintf_chk(dest, 0,
+        __builtin_object_size(dest, 0), format, ap);
+}
+
+
+# if !defined(__clang__)
+/*
+ * Clang doesn't have support for __builtin_va_arg_pack()
+ * http://clang.llvm.org/docs/UsersManual.html#c_unimpl_gcc
+ */
+
+__BIONIC_FORTIFY_INLINE
+__attribute__((__format__ (printf, 3, 4)))
+__attribute__((__nonnull__ (3)))
+int snprintf(char *str, size_t size, const char *format, ...)
+{
+    return __builtin___snprintf_chk(str, size, 0,
+        __builtin_object_size(str, 0), format, __builtin_va_arg_pack());
+}
+
+__BIONIC_FORTIFY_INLINE
+__attribute__((__format__ (printf, 2, 3)))
+__attribute__((__nonnull__ (2)))
+int sprintf(char *dest, const char *format, ...)
+{
+    return __builtin___sprintf_chk(dest, 0,
+        __builtin_object_size(dest, 0), format, __builtin_va_arg_pack());
+}
+
+# endif /* !defined(__clang__) */
+
+#endif /* defined(__BIONIC_FORTIFY_INLINE) */
+
 #endif /* _STDIO_H_ */
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index e5caadd..9c0e556 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -74,9 +74,9 @@
     return (float)strtod(nptr, endptr);
 }
 
-extern int atoi(const char *);
-extern long atol(const char *);
-extern long long atoll(const char *);
+extern int atoi(const char *) __purefunc;
+extern long atol(const char *) __purefunc;
+extern long long atoll(const char *) __purefunc;
 
 static __inline__ double atof(const char *nptr)
 {
diff --git a/libc/include/string.h b/libc/include/string.h
index 6e6c8e6..32fd25f 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -85,6 +85,107 @@
 extern int    strcoll(const char *, const char *) __purefunc;
 extern size_t strxfrm(char *, const char *, size_t);
 
+#if defined(__BIONIC_FORTIFY_INLINE)
+
+__BIONIC_FORTIFY_INLINE
+void *memcpy (void *dest, const void *src, size_t len) {
+    return __builtin___memcpy_chk(dest, src, len, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+void *memmove (void *dest, const void *src, size_t len) {
+    return __builtin___memmove_chk(dest, src, len, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+char *strcpy(char *dest, const char *src) {
+    return __builtin___strcpy_chk(dest, src, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+char *strncpy(char *dest, const char *src, size_t n) {
+    return __builtin___strncpy_chk(dest, src, n, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+char *strcat(char *dest, const char *src) {
+    return __builtin___strcat_chk(dest, src, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+char *strncat(char *dest, const char *src, size_t n) {
+    return __builtin___strncat_chk(dest, src, n, __builtin_object_size (dest, 0));
+}
+
+__BIONIC_FORTIFY_INLINE
+void *memset (void *s, int c, size_t n) {
+    return __builtin___memset_chk(s, c, n, __builtin_object_size (s, 0));
+}
+
+extern size_t __strlcpy_real(char *, const char *, size_t)
+    __asm__(__USER_LABEL_PREFIX__ "strlcpy");
+extern void __strlcpy_error()
+    __attribute__((__error__("strlcpy called with size bigger than buffer")));
+extern size_t __strlcpy_chk(char *, const char *, size_t, size_t);
+
+__BIONIC_FORTIFY_INLINE
+size_t strlcpy(char *dest, const char *src, size_t size) {
+    size_t bos = __builtin_object_size(dest, 0);
+
+    // Compiler doesn't know destination size. Don't call __strlcpy_chk
+    if (bos == (size_t) -1) {
+        return __strlcpy_real(dest, src, size);
+    }
+
+    // Compiler can prove, at compile time, that the passed in size
+    // is always <= the actual object size. Don't call __strlcpy_chk
+    if (__builtin_constant_p(size) && (size <= bos)) {
+        return __strlcpy_real(dest, src, size);
+    }
+
+    // Compiler can prove, at compile time, that the passed in size
+    // is always > the actual object size. Force a compiler error.
+    if (__builtin_constant_p(size) && (size > bos)) {
+        __strlcpy_error();
+    }
+
+    return __strlcpy_chk(dest, src, size, bos);
+}
+
+extern size_t __strlcat_real(char *, const char *, size_t)
+    __asm__(__USER_LABEL_PREFIX__ "strlcat");
+extern void __strlcat_error()
+    __attribute__((__error__("strlcat called with size bigger than buffer")));
+extern size_t __strlcat_chk(char *, const char *, size_t, size_t);
+
+
+__BIONIC_FORTIFY_INLINE
+size_t strlcat(char *dest, const char *src, size_t size) {
+    size_t bos = __builtin_object_size(dest, 0);
+
+    // Compiler doesn't know destination size. Don't call __strlcat_chk
+    if (bos == (size_t) -1) {
+        return __strlcat_real(dest, src, size);
+    }
+
+    // Compiler can prove, at compile time, that the passed in size
+    // is always <= the actual object size. Don't call __strlcat_chk
+    if (__builtin_constant_p(size) && (size <= bos)) {
+        return __strlcat_real(dest, src, size);
+    }
+
+    // Compiler can prove, at compile time, that the passed in size
+    // is always > the actual object size. Force a compiler error.
+    if (__builtin_constant_p(size) && (size > bos)) {
+        __strlcat_error();
+    }
+
+    return __strlcat_chk(dest, src, size, bos);
+}
+
+
+#endif /* defined(__BIONIC_FORTIFY_INLINE) */
+
 __END_DECLS
 
 #endif /* _STRING_H_ */
diff --git a/libc/include/strings.h b/libc/include/strings.h
index fee7dc4..db2aa3a 100644
--- a/libc/include/strings.h
+++ b/libc/include/strings.h
@@ -51,6 +51,14 @@
 char	*rindex(const char *, int);
 int	 strcasecmp(const char *, const char *);
 int	 strncasecmp(const char *, const char *, size_t);
+
+#if defined(__BIONIC_FORTIFY_INLINE)
+__BIONIC_FORTIFY_INLINE
+void bzero (void *s, size_t n) {
+    __builtin___memset_chk(s, '\0', n, __builtin_object_size (s, 0));
+}
+#endif /* defined(__BIONIC_FORTIFY_INLINE) */
+
 __END_DECLS
 
 #endif /* !defined(_STRINGS_H_) */
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 71b419c..1ba9100 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -501,4 +501,12 @@
 #define  __BIONIC__   1
 #include <android/api-level.h>
 
+#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
+#define __BIONIC_FORTIFY_INLINE \
+    extern inline \
+    __attribute__ ((always_inline)) \
+    __attribute__ ((gnu_inline)) \
+    __attribute__ ((artificial))
+#endif
+
 #endif /* !_SYS_CDEFS_H_ */
diff --git a/libc/inet/inet_ntop.c b/libc/inet/inet_ntop.c
index 5748da3..c3448f1 100644
--- a/libc/inet/inet_ntop.c
+++ b/libc/inet/inet_ntop.c
@@ -75,8 +75,13 @@
 	char tmp[sizeof "255.255.255.255"];
 	int l;
 
+#if defined(ANDROID_CHANGES)
+	l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
+	if (l <= 0 || (size_t)l >= size || (size_t)l >= sizeof(tmp)) {
+#else
 	l = snprintf(tmp, size, fmt, src[0], src[1], src[2], src[3]);
 	if (l <= 0 || (size_t)l >= size) {
+#endif
 		errno = ENOSPC;
 		return (NULL);
 	}
diff --git a/libc/kernel/common/linux/filter.h b/libc/kernel/common/linux/filter.h
index 613ee67..e5b2e95 100644
--- a/libc/kernel/common/linux/filter.h
+++ b/libc/kernel/common/linux/filter.h
@@ -23,94 +23,102 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_MAJOR_VERSION 1
 #define BPF_MINOR_VERSION 1
-struct sock_filter
-{
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct sock_filter {
  __u16 code;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  __u8 jt;
  __u8 jf;
  __u32 k;
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-struct sock_fprog
-{
- unsigned short len;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct sock_fprog {
+ unsigned short len;
  struct sock_filter __user *filter;
 };
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_CLASS(code) ((code) & 0x07)
 #define BPF_LD 0x00
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_LDX 0x01
 #define BPF_ST 0x02
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_STX 0x03
 #define BPF_ALU 0x04
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_JMP 0x05
 #define BPF_RET 0x06
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_MISC 0x07
 #define BPF_SIZE(code) ((code) & 0x18)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_W 0x00
 #define BPF_H 0x08
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_B 0x10
 #define BPF_MODE(code) ((code) & 0xe0)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_IMM 0x00
 #define BPF_ABS 0x20
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_IND 0x40
 #define BPF_MEM 0x60
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_LEN 0x80
 #define BPF_MSH 0xa0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_OP(code) ((code) & 0xf0)
 #define BPF_ADD 0x00
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_SUB 0x10
 #define BPF_MUL 0x20
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_DIV 0x30
 #define BPF_OR 0x40
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_AND 0x50
 #define BPF_LSH 0x60
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_RSH 0x70
 #define BPF_NEG 0x80
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_JA 0x00
 #define BPF_JEQ 0x10
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_JGT 0x20
 #define BPF_JGE 0x30
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_JSET 0x40
 #define BPF_SRC(code) ((code) & 0x08)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_K 0x00
 #define BPF_X 0x08
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_RVAL(code) ((code) & 0x18)
 #define BPF_A 0x10
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_MISCOP(code) ((code) & 0xf8)
 #define BPF_TAX 0x00
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_TXA 0x80
 #ifndef BPF_MAXINSNS
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_MAXINSNS 4096
 #endif
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #ifndef BPF_STMT
 #define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
 #ifndef BPF_JUMP
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define BPF_MEMWORDS 16
 #define SKF_AD_OFF (-0x1000)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SKF_AD_PROTOCOL 0
 #define SKF_AD_PKTTYPE 4
-#define SKF_AD_IFINDEX 8
-#define SKF_AD_MAX 12
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SKF_AD_IFINDEX 8
+#define SKF_AD_NLATTR 12
+#define SKF_AD_NLATTR_NEST 16
+#define SKF_AD_MARK 20
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SKF_AD_QUEUE 24
+#define SKF_AD_HATYPE 28
+#define SKF_AD_RXHASH 32
+#define SKF_AD_CPU 36
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SKF_AD_ALU_XOR_X 40
+#define SKF_AD_MAX 44
 #define SKF_NET_OFF (-0x100000)
 #define SKF_LL_OFF (-0x200000)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
diff --git a/libc/kernel/common/linux/ion.h b/libc/kernel/common/linux/ion.h
index b8715a3..0f872ec 100644
--- a/libc/kernel/common/linux/ion.h
+++ b/libc/kernel/common/linux/ion.h
@@ -33,34 +33,38 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ION_HEAP_SYSTEM_CONTIG_MASK (1 << ION_HEAP_TYPE_SYSTEM_CONTIG)
 #define ION_HEAP_CARVEOUT_MASK (1 << ION_HEAP_TYPE_CARVEOUT)
+#define ION_FLAG_CACHED 1  
 struct ion_allocation_data {
- size_t len;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ size_t len;
  size_t align;
+ unsigned int heap_mask;
  unsigned int flags;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct ion_handle *handle;
 };
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct ion_fd_data {
  struct ion_handle *handle;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  int fd;
 };
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct ion_handle_data {
  struct ion_handle *handle;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 struct ion_custom_data {
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  unsigned int cmd;
  unsigned long arg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
 #define ION_IOC_MAGIC 'I'
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0,   struct ion_allocation_data)
 #define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ION_IOC_MAP _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data)
 #define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
-/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define ION_IOC_IMPORT _IOWR(ION_IOC_MAGIC, 5, int)
 #define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif
+
diff --git a/libc/kernel/common/linux/prctl.h b/libc/kernel/common/linux/prctl.h
index 8906639..5e79143 100644
--- a/libc/kernel/common/linux/prctl.h
+++ b/libc/kernel/common/linux/prctl.h
@@ -64,5 +64,57 @@
 #define PR_ENDIAN_BIG 0
 #define PR_ENDIAN_LITTLE 1  
 #define PR_ENDIAN_PPC_LITTLE 2  
-#endif
+#define PR_GET_SECCOMP 21
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_SECCOMP 22
+#define PR_CAPBSET_READ 23
+#define PR_CAPBSET_DROP 24
+#define PR_GET_TSC 25
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_TSC 26
+#define PR_TSC_ENABLE 1  
+#define PR_TSC_SIGSEGV 2  
+#define PR_GET_SECUREBITS 27
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_SECUREBITS 28
+#define PR_SET_TIMERSLACK 29
+#define PR_GET_TIMERSLACK 30
+#define PR_TASK_PERF_EVENTS_DISABLE 31
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_TASK_PERF_EVENTS_ENABLE 32
+#define PR_MCE_KILL 33
+#define PR_MCE_KILL_CLEAR 0
+#define PR_MCE_KILL_SET 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_MCE_KILL_LATE 0
+#define PR_MCE_KILL_EARLY 1
+#define PR_MCE_KILL_DEFAULT 2
+#define PR_MCE_KILL_GET 34
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_MM 35
+#define PR_SET_MM_START_CODE 1
+#define PR_SET_MM_END_CODE 2
+#define PR_SET_MM_START_DATA 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_MM_END_DATA 4
+#define PR_SET_MM_START_STACK 5
+#define PR_SET_MM_START_BRK 6
+#define PR_SET_MM_BRK 7
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_MM_ARG_START 8
+#define PR_SET_MM_ARG_END 9
+#define PR_SET_MM_ENV_START 10
+#define PR_SET_MM_ENV_END 11
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_MM_AUXV 12
+#define PR_SET_MM_EXE_FILE 13
+#define PR_SET_PTRACER 0x59616d61
+#define PR_SET_PTRACER_ANY ((unsigned long)-1)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_SET_CHILD_SUBREAPER 36
+#define PR_GET_CHILD_SUBREAPER 37
+#define PR_SET_NO_NEW_PRIVS 38
+#define PR_GET_NO_NEW_PRIVS 39
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PR_GET_TID_ADDRESS 40
+#endif
diff --git a/libc/kernel/common/linux/seccomp.h b/libc/kernel/common/linux/seccomp.h
new file mode 100644
index 0000000..82a6985
--- /dev/null
+++ b/libc/kernel/common/linux/seccomp.h
@@ -0,0 +1,44 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_SECCOMP_H
+#define _LINUX_SECCOMP_H
+#include <linux/compiler.h>
+#include <linux/types.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SECCOMP_MODE_DISABLED 0  
+#define SECCOMP_MODE_STRICT 1  
+#define SECCOMP_MODE_FILTER 2  
+#define SECCOMP_RET_KILL 0x00000000U  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SECCOMP_RET_TRAP 0x00030000U  
+#define SECCOMP_RET_ERRNO 0x00050000U  
+#define SECCOMP_RET_TRACE 0x7ff00000U  
+#define SECCOMP_RET_ALLOW 0x7fff0000U  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SECCOMP_RET_ACTION 0x7fff0000U
+#define SECCOMP_RET_DATA 0x0000ffffU
+struct seccomp_data {
+ int nr;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 arch;
+ __u64 instruction_pointer;
+ __u64 args[6];
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif
diff --git a/libc/kernel/common/linux/watchdog.h b/libc/kernel/common/linux/watchdog.h
new file mode 100644
index 0000000..4cbff4b
--- /dev/null
+++ b/libc/kernel/common/linux/watchdog.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_WATCHDOG_H
+#define _LINUX_WATCHDOG_H
+#include <linux/ioctl.h>
+#include <linux/types.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WATCHDOG_IOCTL_BASE 'W'
+struct watchdog_info {
+ __u32 options;
+ __u32 firmware_version;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u8 identity[32];
+};
+#define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
+#define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, 2, int)
+#define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int)
+#define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int)
+#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
+#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int)
+#define WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 8, int)
+#define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int)
+#define WDIOF_UNKNOWN -1  
+#define WDIOS_UNKNOWN -1  
+#define WDIOF_OVERHEAT 0x0001  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOF_FANFAULT 0x0002  
+#define WDIOF_EXTERN1 0x0004  
+#define WDIOF_EXTERN2 0x0008  
+#define WDIOF_POWERUNDER 0x0010  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOF_CARDRESET 0x0020  
+#define WDIOF_POWEROVER 0x0040  
+#define WDIOF_SETTIMEOUT 0x0080  
+#define WDIOF_MAGICCLOSE 0x0100  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOF_PRETIMEOUT 0x0200  
+#define WDIOF_KEEPALIVEPING 0x8000  
+#define WDIOS_DISABLECARD 0x0001  
+#define WDIOS_ENABLECARD 0x0002  
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define WDIOS_TEMPPANIC 0x0004  
+#endif
diff --git a/libc/netbsd/resolv/res_send.c b/libc/netbsd/resolv/res_send.c
index 2f131f1..72a7ada 100644
--- a/libc/netbsd/resolv/res_send.c
+++ b/libc/netbsd/resolv/res_send.c
@@ -1147,6 +1147,9 @@
 		 * XXX - potential security hazard could
 		 *	 be detected here.
 		 */
+#ifdef ANDROID_CHANGES
+		__libc_android_log_event_uid(BIONIC_EVENT_RESOLVER_OLD_RESPONSE);
+#endif
 		DprintQ((statp->options & RES_DEBUG) ||
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; old answer:\n"),
@@ -1160,6 +1163,9 @@
 		 * XXX - potential security hazard could
 		 *	 be detected here.
 		 */
+#ifdef ANDROID_CHANGES
+		__libc_android_log_event_uid(BIONIC_EVENT_RESOLVER_WRONG_SERVER);
+#endif
 		DprintQ((statp->options & RES_DEBUG) ||
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; not our server:\n"),
@@ -1190,6 +1196,9 @@
 		 * XXX - potential security hazard could
 		 *	 be detected here.
 		 */
+#ifdef ANDROID_CHANGES
+		__libc_android_log_event_uid(BIONIC_EVENT_RESOLVER_WRONG_QUERY);
+#endif
 		DprintQ((statp->options & RES_DEBUG) ||
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; wrong query name:\n"),
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/private/__dso_handle.h
similarity index 70%
rename from libc/arch-arm/bionic/atexit.S
rename to libc/private/__dso_handle.h
index beea685..e67ce7c 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/private/__dso_handle.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,9 @@
  * SUCH DAMAGE.
  */
 
+
 #ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
+__attribute__ ((visibility ("hidden")))
 #endif
+__attribute__ ((section (".bss")))
+void *__dso_handle = (void *) 0;
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/private/__dso_handle_so.c
similarity index 68%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/private/__dso_handle_so.c
index beea685..198e64b 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/private/__dso_handle_so.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,7 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+
+__attribute__ ((visibility ("hidden")))
+__attribute__ ((section (".data")))
+void *__dso_handle;
diff --git a/libc/private/logd.h b/libc/private/logd.h
index 4a9b62e..8970daf 100644
--- a/libc/private/logd.h
+++ b/libc/private/logd.h
@@ -30,6 +30,21 @@
 
 #include <stdarg.h>
 
+#define BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW 80100
+#define BIONIC_EVENT_STRCAT_BUFFER_OVERFLOW 80105
+#define BIONIC_EVENT_MEMMOVE_BUFFER_OVERFLOW 80110
+#define BIONIC_EVENT_STRNCAT_BUFFER_OVERFLOW 80115
+#define BIONIC_EVENT_STRNCPY_BUFFER_OVERFLOW 80120
+#define BIONIC_EVENT_MEMSET_BUFFER_OVERFLOW 80125
+#define BIONIC_EVENT_STRCPY_BUFFER_OVERFLOW 80130
+
+#define BIONIC_EVENT_STRCAT_INTEGER_OVERFLOW 80200
+#define BIONIC_EVENT_STRNCAT_INTEGER_OVERFLOW 80205
+
+#define BIONIC_EVENT_RESOLVER_OLD_RESPONSE 80300
+#define BIONIC_EVENT_RESOLVER_WRONG_SERVER 80305
+#define BIONIC_EVENT_RESOLVER_WRONG_QUERY 80310
+
 enum  {
     ANDROID_LOG_UNKNOWN = 0,
     ANDROID_LOG_DEFAULT,    /* only for SetMinPriority() */
@@ -48,4 +63,7 @@
 int __libc_android_log_print(int prio, const char *tag, const char *fmt, ...);
 int __libc_android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap);
 
+void __libc_android_log_event_int(int32_t tag, int value);
+void __libc_android_log_event_uid(int32_t tag);
+
 #endif /* _ANDROID_BIONIC_LOGD_H */
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/stdio/__snprintf_chk.c
similarity index 62%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/stdio/__snprintf_chk.c
index beea685..dbda3db 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/stdio/__snprintf_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,34 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <stdio.h>
+#include <stdarg.h>
+
+/*
+ * Runtime implementation of __builtin____snprintf_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This snprintf check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+int __snprintf_chk(
+        char *dest,
+        size_t supplied_size,
+        int flags,
+        size_t dest_len_from_compiler,
+        const char *format, ...)
+{
+    va_list va;
+    int retval;
+
+    va_start(va, format);
+    retval = __vsnprintf_chk(dest, supplied_size, flags,
+                             dest_len_from_compiler, format, va);
+    va_end(va);
+
+    return retval;
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/stdio/__sprintf_chk.c
similarity index 64%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/stdio/__sprintf_chk.c
index beea685..67acbe1 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/stdio/__sprintf_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,33 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <stdio.h>
+#include <stdarg.h>
+
+/*
+ * Runtime implementation of __builtin____sprintf_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This sprintf check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+int __sprintf_chk(
+        char *dest,
+        int flags,
+        size_t dest_len_from_compiler,
+        const char *format, ...)
+{
+    va_list va;
+    int retval;
+
+    va_start(va, format);
+    retval = __vsprintf_chk(dest, flags,
+                             dest_len_from_compiler, format, va);
+    va_end(va);
+
+    return retval;
+}
diff --git a/libc/arch-arm/bionic/crtbegin_so.S b/libc/stdio/__vsnprintf_chk.c
similarity index 60%
rename from libc/arch-arm/bionic/crtbegin_so.S
rename to libc/stdio/__vsnprintf_chk.c
index 104d214..a1a1039 100644
--- a/libc/arch-arm/bionic/crtbegin_so.S
+++ b/libc/stdio/__vsnprintf_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,39 +26,35 @@
  * SUCH DAMAGE.
  */
 
-#include <machine/asm.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <private/logd.h>
 
-# Implement static C++ destructors when the shared
-# library is unloaded through dlclose().
-#
-# A call to this function must be the first entry
-# in the .fini_array. See 3.3.5.3.C of C++ ABI
-# standard.
-#
-ENTRY(__on_dlclose)
-        adr     r0, 0f
-        ldr     r0, [r0]
-        b       __cxa_finalize
-END(__on_dlclose)
+/*
+ * Runtime implementation of __builtin____vsnprintf_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This vsnprintf check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+int __vsnprintf_chk(
+        char *dest,
+        size_t supplied_size,
+        int flags,
+        size_t dest_len_from_compiler,
+        const char *format,
+        va_list va)
+{
+    if (supplied_size > dest_len_from_compiler) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** vsnprintf buffer overflow detected ***\n");
+        abort();
+    }
 
-0:
-        .long   __dso_handle
-
-	.section .init_array, "aw"
-	.globl __INIT_ARRAY__
-__INIT_ARRAY__:
-	.long -1
-
-        .section .fini_array, "aw"
-        .globl __FINI_ARRAY__
-__FINI_ARRAY__:
-        .long -1
-        .long __on_dlclose
-
-#ifdef CRT_LEGACY_WORKAROUND
-#include "__dso_handle.S"
-#else
-#include "__dso_handle_so.S"
-#endif
-
-#include "atexit.S"
+    return vsnprintf(dest, supplied_size, format, va);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/stdio/__vsprintf_chk.c
similarity index 60%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/stdio/__vsprintf_chk.c
index beea685..8a809fc 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/stdio/__vsprintf_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,36 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____vsprintf_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This vsprintf check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+int __vsprintf_chk(
+        char *dest,
+        int flags,
+        size_t dest_len_from_compiler,
+        const char *format,
+        va_list va)
+{
+    int ret = vsnprintf(dest, dest_len_from_compiler, format, va);
+
+    if ((size_t) ret >= dest_len_from_compiler) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** vsprintf buffer overflow detected ***\n");
+        abort();
+    }
+
+    return ret;
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__memcpy_chk.c
similarity index 62%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__memcpy_chk.c
index beea685..e79f6ac 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__memcpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,30 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____memcpy_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This memcpy check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+void *__memcpy_chk (void *dest, const void *src,
+              size_t len, size_t dest_len)
+{
+    if (len > dest_len) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** memcpy buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_MEMCPY_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return memcpy(dest, src, len);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__memmove_chk.c
similarity index 62%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__memmove_chk.c
index beea685..529eb8f 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__memmove_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,30 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____memmove_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This memmove check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+void *__memmove_chk (void *dest, const void *src,
+              size_t len, size_t dest_len)
+{
+    if (len > dest_len) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** memmove buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_MEMMOVE_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return memmove(dest, src, len);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__memset_chk.c
similarity index 63%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__memset_chk.c
index beea685..0904c03 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__memset_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,29 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____memset_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This memset check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+void *__memset_chk (void *dest, int c, size_t n, size_t dest_len)
+{
+    if (n > dest_len) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** memset buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_MEMSET_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return memset(dest, c, n);
+}
diff --git a/libc/string/__strcat_chk.c b/libc/string/__strcat_chk.c
new file mode 100644
index 0000000..4665d66
--- /dev/null
+++ b/libc/string/__strcat_chk.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+#include <safe_iop.h>
+
+/*
+ * Runtime implementation of __builtin____strcat_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strcat check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+char *__strcat_chk (char *dest, const char *src, size_t dest_buf_size)
+{
+    // TODO: optimize so we don't scan src/dest twice.
+    size_t src_len  = strlen(src);
+    size_t dest_len = strlen(dest);
+    size_t sum;
+
+    // sum = src_len + dest_len + 1 (with overflow protection)
+    if (!safe_add3(&sum, src_len, dest_len, 1U)) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strcat integer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRCAT_INTEGER_OVERFLOW);
+        abort();
+    }
+
+    if (sum > dest_buf_size) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strcat buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRNCAT_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return strcat(dest, src);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__strcpy_chk.c
similarity index 60%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__strcpy_chk.c
index beea685..79486b4 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__strcpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,31 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____strcpy_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strcpy check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+char *__strcpy_chk (char *dest, const char *src, size_t dest_len)
+{
+    // TODO: optimize so we don't scan src twice.
+    size_t src_len = strlen(src) + 1;
+    if (src_len > dest_len) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strcpy buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRCPY_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return strcpy(dest, src);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__strlcat_chk.c
similarity index 61%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__strlcat_chk.c
index beea685..b895fb8 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__strlcat_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,30 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * __strlcat_chk. Called in place of strlcat() when we know the
+ * size of the buffer we're writing into.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strlcat check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+size_t __strlcat_chk(char *dest, const char *src,
+              size_t supplied_size, size_t dest_len_from_compiler)
+{
+    if (supplied_size > dest_len_from_compiler) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strlcat buffer overflow detected ***\n");
+        abort();
+    }
+
+    return strlcat(dest, src, supplied_size);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__strlcpy_chk.c
similarity index 61%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__strlcpy_chk.c
index beea685..752c86c 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__strlcpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,30 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * __strlcpy_chk. Called in place of strlcpy() when we know the
+ * size of the buffer we're writing into.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strlcpy check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+size_t __strlcpy_chk(char *dest, const char *src,
+              size_t supplied_size, size_t dest_len_from_compiler)
+{
+    if (supplied_size > dest_len_from_compiler) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strlcpy buffer overflow detected ***\n");
+        abort();
+    }
+
+    return strlcpy(dest, src, supplied_size);
+}
diff --git a/libc/string/__strncat_chk.c b/libc/string/__strncat_chk.c
new file mode 100644
index 0000000..2036c9f
--- /dev/null
+++ b/libc/string/__strncat_chk.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+#include <safe_iop.h>
+
+/*
+ * Runtime implementation of __builtin____strncat_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strncat check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+char *__strncat_chk (char *dest, const char *src,
+              size_t len, size_t dest_buf_size)
+{
+    // TODO: optimize so we don't scan src/dest twice.
+    size_t dest_len = strlen(dest);
+    size_t src_len = strlen(src);
+    if (src_len > len) {
+        src_len = len;
+    }
+
+    size_t sum;
+    // sum = src_len + dest_len + 1 (with overflow protection)
+    if (!safe_add3(&sum, src_len, dest_len, 1U)) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strncat integer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRNCAT_INTEGER_OVERFLOW);
+        abort();
+    }
+
+    if (sum > dest_buf_size) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strncat buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRNCAT_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return strncat(dest, src, len);
+}
diff --git a/libc/arch-arm/bionic/atexit.S b/libc/string/__strncpy_chk.c
similarity index 62%
copy from libc/arch-arm/bionic/atexit.S
copy to libc/string/__strncpy_chk.c
index beea685..3f9e9fb 100644
--- a/libc/arch-arm/bionic/atexit.S
+++ b/libc/string/__strncpy_chk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -26,37 +26,30 @@
  * SUCH DAMAGE.
  */
 
-#ifndef CRT_LEGACY_WORKAROUND
-	.arch armv5te
-	.fpu softvfp
-	.eabi_attribute 20, 1
-	.eabi_attribute 21, 1
-	.eabi_attribute 23, 3
-	.eabi_attribute 24, 1
-	.eabi_attribute 25, 1
-	.eabi_attribute 26, 2
-	.eabi_attribute 30, 4
-	.eabi_attribute 18, 4
-	.hidden	atexit
-	.code	16
-	.thumb_func
-ENTRY(atexit)
-.LFB0:
-	.save	{r4, lr}
-	push	{r4, lr}
-.LCFI0:
-	ldr	r3, .L3
-	mov	r1, #0
-	@ sp needed for prologue
-.LPIC0:
-	add	r3, pc
-	ldr	r2, [r3]
-	bl	__cxa_atexit
-	pop	{r4, pc}
-.L4:
-	.align	2
-.L3:
-	.word	__dso_handle-(.LPIC0+4)
-.LFE0:
-END(atexit)
-#endif
+#include <string.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * Runtime implementation of __builtin____strncpy_chk.
+ *
+ * See
+ *   http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ *   http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
+ * for details.
+ *
+ * This strncpy check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+char *__strncpy_chk (char *dest, const char *src,
+              size_t len, size_t dest_len)
+{
+    if (len > dest_len) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** strncpy buffer overflow detected ***\n");
+        __libc_android_log_event_uid(BIONIC_EVENT_STRNCPY_BUFFER_OVERFLOW);
+        abort();
+    }
+
+    return strncpy(dest, src, len);
+}
diff --git a/libc/unistd/open.c b/libc/unistd/open.c
index 03cba45..56602db 100644
--- a/libc/unistd/open.c
+++ b/libc/unistd/open.c
@@ -28,6 +28,8 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <stdarg.h>
+#include <stdlib.h>
+#include <private/logd.h>
 
 extern int  __open(const char*, int, int);
 
@@ -49,3 +51,15 @@
     return __open(pathname, flags, mode);
 }
 
+int __open_2(const char *pathname, int flags) {
+    if (flags & O_CREAT) {
+        __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+            "*** open(O_CREAT) called without specifying a mode ***\n");
+        abort();
+    }
+
+    flags |= O_LARGEFILE;
+
+    return __open(pathname, flags, 0);
+}
+
diff --git a/linker/Android.mk b/linker/Android.mk
index 2f39cbe..a739b4f 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -6,6 +6,7 @@
 	linker.c \
 	linker_environ.c \
 	linker_format.c \
+	linker_phdr.c \
 	rt.c \
 	dlfcn.c \
 	debugger.c
diff --git a/linker/dlfcn.c b/linker/dlfcn.c
index ac7e5d3..3d0384f 100644
--- a/linker/dlfcn.c
+++ b/linker/dlfcn.c
@@ -60,7 +60,7 @@
     if (unlikely(ret == NULL)) {
         set_dlerror(DL_ERR_CANNOT_LOAD_LIBRARY);
     } else {
-        call_constructors_recursive(ret);
+        soinfo_call_constructors(ret);
         ret->refcount++;
     }
     pthread_mutex_unlock(&dl_lock);
@@ -103,7 +103,7 @@
         }
     } else {
         found = (soinfo*)handle;
-        sym = lookup_in_library(found, symbol);
+        sym = soinfo_lookup(found, symbol);
     }
 
     if(likely(sym != 0)) {
@@ -141,7 +141,7 @@
         info->dli_fbase = (void*)si->base;
 
         /* Determine if any symbol in the library contains the specified address */
-        Elf32_Sym *sym = find_containing_symbol(addr, si);
+        Elf32_Sym *sym = soinfo_find_symbol(si, addr);
 
         if(sym != NULL) {
             info->dli_sname = si->strtab + sym->st_name;
@@ -159,7 +159,7 @@
 int dlclose(void *handle)
 {
     pthread_mutex_lock(&dl_lock);
-    (void)unload_library((soinfo*)handle);
+    (void)soinfo_unload((soinfo*)handle);
     pthread_mutex_unlock(&dl_lock);
     return 0;
 }
diff --git a/linker/linker.c b/linker/linker.c
index df4a8b1..54fb22b 100644
--- a/linker/linker.c
+++ b/linker/linker.c
@@ -50,6 +50,7 @@
 #include "linker_debug.h"
 #include "linker_environ.h"
 #include "linker_format.h"
+#include "linker_phdr.h"
 
 #define ALLOW_SYMBOLS_FROM_MAIN 1
 #define SO_MAX 128
@@ -82,7 +83,7 @@
 */
 
 
-static int link_image(soinfo *si, unsigned wr_offset);
+static int soinfo_link_image(soinfo *si, unsigned wr_offset);
 
 static int socount = 0;
 static soinfo sopool[SO_MAX];
@@ -125,10 +126,6 @@
 unsigned bitmask[4096];
 #endif
 
-#ifndef PT_ARM_EXIDX
-#define PT_ARM_EXIDX    0x70000001      /* .ARM.exidx segment */
-#endif
-
 #define HOODLUM(name, ret, ...)                                               \
     ret name __VA_ARGS__                                                      \
     {                                                                         \
@@ -254,7 +251,7 @@
     rtld_db_dlactivity();
 }
 
-static soinfo *alloc_info(const char *name)
+static soinfo *soinfo_alloc(const char *name)
 {
     soinfo *si;
 
@@ -263,7 +260,7 @@
         return NULL;
     }
 
-    /* The freelist is populated when we call free_info(), which in turn is
+    /* The freelist is populated when we call soinfo_free(), which in turn is
        done only by dlclose(), which is not likely to be used.
     */
     if (!freelist) {
@@ -290,7 +287,7 @@
     return si;
 }
 
-static void free_info(soinfo *si)
+static void soinfo_free(soinfo *si)
 {
     soinfo *prev = NULL, *trav;
 
@@ -347,7 +344,7 @@
     for (si = solist; si != 0; si = si->next){
         if ((addr >= si->base) && (addr < (si->base + si->size))) {
             *pcount = si->ARM_exidx_count;
-            return (_Unwind_Ptr)(si->base + (unsigned long)si->ARM_exidx);
+            return (_Unwind_Ptr)si->ARM_exidx;
         }
     }
    *pcount = 0;
@@ -377,7 +374,7 @@
 }
 #endif
 
-static Elf32_Sym *_elf_lookup(soinfo *si, unsigned hash, const char *name)
+static Elf32_Sym *soinfo_elf_lookup(soinfo *si, unsigned hash, const char *name)
 {
     Elf32_Sym *s;
     Elf32_Sym *symtab = si->symtab;
@@ -423,7 +420,7 @@
 }
 
 static Elf32_Sym *
-_do_lookup(soinfo *si, const char *name, unsigned *base)
+soinfo_do_lookup(soinfo *si, const char *name, Elf32_Addr *offset)
 {
     unsigned elf_hash = elfhash(name);
     Elf32_Sym *s;
@@ -441,14 +438,14 @@
      * and some the first non-weak definition.   This is system dependent.
      * Here we return the first definition found for simplicity.  */
 
-    s = _elf_lookup(si, elf_hash, name);
+    s = soinfo_elf_lookup(si, elf_hash, name);
     if(s != NULL)
         goto done;
 
     /* Next, look for it in the preloads list */
     for(i = 0; preloads[i] != NULL; i++) {
         lsi = preloads[i];
-        s = _elf_lookup(lsi, elf_hash, name);
+        s = soinfo_elf_lookup(lsi, elf_hash, name);
         if(s != NULL)
             goto done;
     }
@@ -464,7 +461,7 @@
 
             DEBUG("%5d %s: looking up %s in %s\n",
                   pid, si->name, name, lsi->name);
-            s = _elf_lookup(lsi, elf_hash, name);
+            s = soinfo_elf_lookup(lsi, elf_hash, name);
             if ((s != NULL) && (s->st_shndx != SHN_UNDEF))
                 goto done;
         }
@@ -479,16 +476,17 @@
         lsi = somain;
         DEBUG("%5d %s: looking up %s in executable %s\n",
               pid, si->name, name, lsi->name);
-        s = _elf_lookup(lsi, elf_hash, name);
+        s = soinfo_elf_lookup(lsi, elf_hash, name);
     }
 #endif
 
 done:
     if(s != NULL) {
         TRACE_TYPE(LOOKUP, "%5d si %s sym %s s->st_value = 0x%08x, "
-                   "found in %s, base = 0x%08x\n",
-                   pid, si->name, name, s->st_value, lsi->name, lsi->base);
-        *base = lsi->base;
+                   "found in %s, base = 0x%08x, load bias = 0x%08x\n",
+                   pid, si->name, name, s->st_value,
+                   lsi->name, lsi->base, lsi->load_bias);
+        *offset = lsi->load_bias;
         return s;
     }
 
@@ -498,9 +496,9 @@
 /* This is used by dl_sym().  It performs symbol lookup only within the
    specified soinfo object and not in any of its dependencies.
  */
-Elf32_Sym *lookup_in_library(soinfo *si, const char *name)
+Elf32_Sym *soinfo_lookup(soinfo *si, const char *name)
 {
-    return _elf_lookup(si, elfhash(name), name);
+    return soinfo_elf_lookup(si, elfhash(name), name);
 }
 
 /* This is used by dl_sym().  It performs a global symbol lookup.
@@ -519,7 +517,7 @@
     {
         if(si->flags & FLAG_ERROR)
             continue;
-        s = _elf_lookup(si, elf_hash, name);
+        s = soinfo_elf_lookup(si, elf_hash, name);
         if (s != NULL) {
             *found = si;
             break;
@@ -549,7 +547,7 @@
     return NULL;
 }
 
-Elf32_Sym *find_containing_symbol(const void *addr, soinfo *si)
+Elf32_Sym *soinfo_find_symbol(soinfo* si, const void *addr)
 {
     unsigned int i;
     unsigned soaddr = (unsigned)addr - si->base;
@@ -584,7 +582,7 @@
 }
 #endif
 
-static const char *sopaths[] = {
+static const char * const sopaths[] = {
     "/vendor/lib",
     "/system/lib",
     0
@@ -596,7 +594,7 @@
     struct stat filestat;
 
     if ((stat(name, &filestat) >= 0) && S_ISREG(filestat.st_mode)) {
-        if ((fd = open(name, O_RDONLY)) >= 0)
+        if ((fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY))) >= 0)
             return fd;
     }
 
@@ -607,7 +605,7 @@
 {
     int fd;
     char buf[512];
-    const char **path;
+    const char * const*path;
     int n;
 
     TRACE("[ %5d opening %s ]\n", pid, name);
@@ -640,10 +638,6 @@
     return -1;
 }
 
-/* temporary space for holding the first page of the shared lib
- * which contains the elf header (with the pht). */
-static unsigned char __header[PAGE_SIZE];
-
 typedef struct {
     long mmap_addr;
     char tag[4]; /* 'P', 'R', 'E', ' ' */
@@ -663,12 +657,12 @@
         return 0;
     }
 
-    if (read(fd, &info, sizeof(info)) != sizeof(info)) {
+    if (TEMP_FAILURE_RETRY(read(fd, &info, sizeof(info)) != sizeof(info))) {
         WARN("Could not read prelink_info_t structure for `%s`\n", name);
         return 0;
     }
 
-    if (strncmp(info.tag, "PRE ", 4)) {
+    if (memcmp(info.tag, "PRE ", 4)) {
         WARN("`%s` is not a prelinked library\n", name);
         return 0;
     }
@@ -676,8 +670,8 @@
     return (unsigned long)info.mmap_addr;
 }
 
-/* verify_elf_object
- *      Verifies if the object @ base is a valid ELF object
+/* verify_elf_header
+ *      Verifies the content of an ELF header.
  *
  * Args:
  *
@@ -686,10 +680,8 @@
  *      -1 if no valid ELF object is found @ base.
  */
 static int
-verify_elf_object(void *base, const char *name)
+verify_elf_header(const Elf32_Ehdr* hdr)
 {
-    Elf32_Ehdr *hdr = (Elf32_Ehdr *) base;
-
     if (hdr->e_ident[EI_MAG0] != ELFMAG0) return -1;
     if (hdr->e_ident[EI_MAG1] != ELFMAG1) return -1;
     if (hdr->e_ident[EI_MAG2] != ELFMAG2) return -1;
@@ -705,412 +697,76 @@
 }
 
 
-/* get_lib_extents
- *      Retrieves the base (*base) address where the ELF object should be
- *      mapped and its overall memory size (*total_sz).
- *
- * Args:
- *      fd: Opened file descriptor for the library
- *      name: The name of the library
- *      _hdr: Pointer to the header page of the library
- *      total_sz: Total size of the memory that should be allocated for
- *                this library
- *
- * Returns:
- *      -1 if there was an error while trying to get the lib extents.
- *         The possible reasons are:
- *             - Could not determine if the library was prelinked.
- *             - The library provided is not a valid ELF object
- *       0 if the library did not request a specific base offset (normal
- *         for non-prelinked libs)
- *     > 0 if the library requests a specific address to be mapped to.
- *         This indicates a pre-linked library.
- */
-static unsigned
-get_lib_extents(int fd, const char *name, void *__hdr, unsigned *total_sz)
+static soinfo *
+load_library(const char *name)
 {
+    int fd = open_library(name);
+    int ret, cnt;
+    unsigned ext_sz;
     unsigned req_base;
-    unsigned min_vaddr = 0xffffffff;
-    unsigned max_vaddr = 0;
-    unsigned char *_hdr = (unsigned char *)__hdr;
-    Elf32_Ehdr *ehdr = (Elf32_Ehdr *)_hdr;
-    Elf32_Phdr *phdr;
-    int cnt;
+    const char *bname;
+    struct stat sb;
+    soinfo *si = NULL;
+    Elf32_Ehdr  header[1];
+    int         phdr_count;
+    void*       phdr_mmap = NULL;
+    Elf32_Addr  phdr_size;
+    const Elf32_Phdr* phdr_table;
 
-    TRACE("[ %5d Computing extents for '%s'. ]\n", pid, name);
-    if (verify_elf_object(_hdr, name) < 0) {
-        DL_ERR("%5d - %s is not a valid ELF object", pid, name);
-        return (unsigned)-1;
+    void*       load_start = NULL;
+    Elf32_Addr  load_size = 0;
+    Elf32_Addr  load_bias = 0;
+
+    if (fd == -1) {
+        DL_ERR("Library '%s' not found", name);
+        return NULL;
+    }
+
+    /* Read the ELF header first */
+    ret = TEMP_FAILURE_RETRY(read(fd, (void*)header, sizeof(header)));
+    if (ret < 0) {
+        DL_ERR("%5d can't read file %s: %s", pid, name, strerror(errno));
+        goto fail;
+    }
+    if (ret != (int)sizeof(header)) {
+        DL_ERR("%5d too small to be an ELF executable: %s", pid, name);
+        goto fail;
+    }
+    if (verify_elf_header(header) < 0) {
+        DL_ERR("%5d not a valid ELF executable: %s", pid, name);
+        goto fail;
+    }
+
+    /* Then read the program header table */
+    ret = phdr_table_load(fd, header->e_phoff, header->e_phnum,
+                          &phdr_mmap, &phdr_size, &phdr_table);
+    if (ret < 0) {
+        DL_ERR("%5d can't load program header table: %s: %s", pid,
+               name, strerror(errno));
+        goto fail;
+    }
+    phdr_count = header->e_phnum;
+
+    /* Get the load extents and the prelinked load address, if any */
+    ext_sz = phdr_table_get_load_size(phdr_table, phdr_count);
+    if (ext_sz == 0) {
+        DL_ERR("%5d no loadable segments in file: %s", pid, name);
+        goto fail;
     }
 
     req_base = (unsigned) is_prelinked(fd, name);
-    if (req_base == (unsigned)-1)
-        return -1;
-    else if (req_base != 0) {
+    if (req_base == (unsigned)-1) {
+        DL_ERR("%5d can't read end of library: %s: %s", pid, name,
+               strerror(errno));
+        goto fail;
+    }
+    if (req_base != 0) {
         TRACE("[ %5d - Prelinked library '%s' requesting base @ 0x%08x ]\n",
               pid, name, req_base);
     } else {
         TRACE("[ %5d - Non-prelinked library '%s' found. ]\n", pid, name);
     }
 
-    phdr = (Elf32_Phdr *)(_hdr + ehdr->e_phoff);
-
-    /* find the min/max p_vaddrs from all the PT_LOAD segments so we can
-     * get the range. */
-    for (cnt = 0; cnt < ehdr->e_phnum; ++cnt, ++phdr) {
-        if (phdr->p_type == PT_LOAD) {
-            if ((phdr->p_vaddr + phdr->p_memsz) > max_vaddr)
-                max_vaddr = phdr->p_vaddr + phdr->p_memsz;
-            if (phdr->p_vaddr < min_vaddr)
-                min_vaddr = phdr->p_vaddr;
-        }
-    }
-
-    if ((min_vaddr == 0xffffffff) && (max_vaddr == 0)) {
-        DL_ERR("%5d - No loadable segments found in %s.", pid, name);
-        return (unsigned)-1;
-    }
-
-    /* truncate min_vaddr down to page boundary */
-    min_vaddr &= ~PAGE_MASK;
-
-    /* round max_vaddr up to the next page */
-    max_vaddr = (max_vaddr + PAGE_SIZE - 1) & ~PAGE_MASK;
-
-    *total_sz = (max_vaddr - min_vaddr);
-    return (unsigned)req_base;
-}
-
-/* reserve_mem_region
- *
- *     This function reserves a chunk of memory to be used for mapping in
- *     a prelinked shared library. We reserve the entire memory region here, and
- *     then the rest of the linker will relocate the individual loadable
- *     segments into the correct locations within this memory range.
- *
- * Args:
- *     si->base: The requested base of the allocation.
- *     si->size: The size of the allocation.
- *
- * Returns:
- *     -1 on failure, and 0 on success.  On success, si->base will contain
- *     the virtual address at which the library will be mapped.
- */
-
-static int reserve_mem_region(soinfo *si)
-{
-    void *base = mmap((void *)si->base, si->size, PROT_NONE,
-                      MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-    if (base == MAP_FAILED) {
-        DL_ERR("%5d can NOT map (%sprelinked) library '%s' at 0x%08x "
-              "as requested, will try general pool: %d (%s)",
-              pid, (si->base ? "" : "non-"), si->name, si->base,
-              errno, strerror(errno));
-        return -1;
-    } else if (base != (void *)si->base) {
-        DL_ERR("OOPS: %5d %sprelinked library '%s' mapped at 0x%08x, "
-              "not at 0x%08x", pid, (si->base ? "" : "non-"),
-              si->name, (unsigned)base, si->base);
-        munmap(base, si->size);
-        return -1;
-    }
-    return 0;
-}
-
-static int alloc_mem_region(soinfo *si)
-{
-    if (si->base) {
-        /* Attempt to mmap a prelinked library. */
-        return reserve_mem_region(si);
-    }
-
-    /* This is not a prelinked library, so we use the kernel's default
-       allocator.
-    */
-
-    void *base = mmap(NULL, si->size, PROT_NONE,
-                      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-    if (base == MAP_FAILED) {
-        DL_ERR("%5d mmap of library '%s' failed: %d (%s)\n",
-              pid, si->name,
-              errno, strerror(errno));
-        goto err;
-    }
-    si->base = (unsigned) base;
-    PRINT("%5d mapped library '%s' to %08x via kernel allocator.\n",
-          pid, si->name, si->base);
-    return 0;
-
-err:
-    DL_ERR("OOPS: %5d cannot map library '%s'. no vspace available.",
-          pid, si->name);
-    return -1;
-}
-
-#define MAYBE_MAP_FLAG(x,from,to)    (((x) & (from)) ? (to) : 0)
-#define PFLAGS_TO_PROT(x)            (MAYBE_MAP_FLAG((x), PF_X, PROT_EXEC) | \
-                                      MAYBE_MAP_FLAG((x), PF_R, PROT_READ) | \
-                                      MAYBE_MAP_FLAG((x), PF_W, PROT_WRITE))
-/* load_segments
- *
- *     This function loads all the loadable (PT_LOAD) segments into memory
- *     at their appropriate memory offsets off the base address.
- *
- * Args:
- *     fd: Open file descriptor to the library to load.
- *     header: Pointer to a header page that contains the ELF header.
- *             This is needed since we haven't mapped in the real file yet.
- *     si: ptr to soinfo struct describing the shared object.
- *
- * Returns:
- *     0 on success, -1 on failure.
- */
-static int
-load_segments(int fd, void *header, soinfo *si)
-{
-    Elf32_Ehdr *ehdr = (Elf32_Ehdr *)header;
-    Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned char *)header + ehdr->e_phoff);
-    Elf32_Addr base = (Elf32_Addr) si->base;
-    int cnt;
-    unsigned len;
-    Elf32_Addr tmp;
-    unsigned char *pbase;
-    unsigned char *extra_base;
-    unsigned extra_len;
-    unsigned total_sz = 0;
-
-    si->wrprotect_start = 0xffffffff;
-    si->wrprotect_end = 0;
-
-    TRACE("[ %5d - Begin loading segments for '%s' @ 0x%08x ]\n",
-          pid, si->name, (unsigned)si->base);
-    /* Now go through all the PT_LOAD segments and map them into memory
-     * at the appropriate locations. */
-    for (cnt = 0; cnt < ehdr->e_phnum; ++cnt, ++phdr) {
-        if (phdr->p_type == PT_LOAD) {
-            DEBUG_DUMP_PHDR(phdr, "PT_LOAD", pid);
-            /* we want to map in the segment on a page boundary */
-            tmp = base + (phdr->p_vaddr & (~PAGE_MASK));
-            /* add the # of bytes we masked off above to the total length. */
-            len = phdr->p_filesz + (phdr->p_vaddr & PAGE_MASK);
-
-            TRACE("[ %d - Trying to load segment from '%s' @ 0x%08x "
-                  "(0x%08x). p_vaddr=0x%08x p_offset=0x%08x ]\n", pid, si->name,
-                  (unsigned)tmp, len, phdr->p_vaddr, phdr->p_offset);
-            pbase = mmap((void *)tmp, len, PFLAGS_TO_PROT(phdr->p_flags),
-                         MAP_PRIVATE | MAP_FIXED, fd,
-                         phdr->p_offset & (~PAGE_MASK));
-            if (pbase == MAP_FAILED) {
-                DL_ERR("%d failed to map segment from '%s' @ 0x%08x (0x%08x). "
-                      "p_vaddr=0x%08x p_offset=0x%08x", pid, si->name,
-                      (unsigned)tmp, len, phdr->p_vaddr, phdr->p_offset);
-                goto fail;
-            }
-
-            /* If 'len' didn't end on page boundary, and it's a writable
-             * segment, zero-fill the rest. */
-            if ((len & PAGE_MASK) && (phdr->p_flags & PF_W))
-                memset((void *)(pbase + len), 0, PAGE_SIZE - (len & PAGE_MASK));
-
-            /* Check to see if we need to extend the map for this segment to
-             * cover the diff between filesz and memsz (i.e. for bss).
-             *
-             *  base           _+---------------------+  page boundary
-             *                  .                     .
-             *                  |                     |
-             *                  .                     .
-             *  pbase          _+---------------------+  page boundary
-             *                  |                     |
-             *                  .                     .
-             *  base + p_vaddr _|                     |
-             *                  . \          \        .
-             *                  . | filesz   |        .
-             *  pbase + len    _| /          |        |
-             *     <0 pad>      .            .        .
-             *  extra_base     _+------------|--------+  page boundary
-             *               /  .            .        .
-             *               |  .            .        .
-             *               |  +------------|--------+  page boundary
-             *  extra_len->  |  |            |        |
-             *               |  .            | memsz  .
-             *               |  .            |        .
-             *               \ _|            /        |
-             *                  .                     .
-             *                  |                     |
-             *                 _+---------------------+  page boundary
-             */
-            tmp = (Elf32_Addr)(((unsigned)pbase + len + PAGE_SIZE - 1) &
-                                    (~PAGE_MASK));
-            if (tmp < (base + phdr->p_vaddr + phdr->p_memsz)) {
-                extra_len = base + phdr->p_vaddr + phdr->p_memsz - tmp;
-                TRACE("[ %5d - Need to extend segment from '%s' @ 0x%08x "
-                      "(0x%08x) ]\n", pid, si->name, (unsigned)tmp, extra_len);
-                /* map in the extra page(s) as anonymous into the range.
-                 * This is probably not necessary as we already mapped in
-                 * the entire region previously, but we just want to be
-                 * sure. This will also set the right flags on the region
-                 * (though we can probably accomplish the same thing with
-                 * mprotect).
-                 */
-                extra_base = mmap((void *)tmp, extra_len,
-                                  PFLAGS_TO_PROT(phdr->p_flags),
-                                  MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS,
-                                  -1, 0);
-                if (extra_base == MAP_FAILED) {
-                    DL_ERR("[ %5d - failed to extend segment from '%s' @ 0x%08x"
-                           " (0x%08x) ]", pid, si->name, (unsigned)tmp,
-                          extra_len);
-                    goto fail;
-                }
-                /* TODO: Check if we need to memset-0 this region.
-                 * Anonymous mappings are zero-filled copy-on-writes, so we
-                 * shouldn't need to. */
-                TRACE("[ %5d - Segment from '%s' extended @ 0x%08x "
-                      "(0x%08x)\n", pid, si->name, (unsigned)extra_base,
-                      extra_len);
-            }
-            /* set the len here to show the full extent of the segment we
-             * just loaded, mostly for debugging */
-            len = (((unsigned)base + phdr->p_vaddr + phdr->p_memsz +
-                    PAGE_SIZE - 1) & (~PAGE_MASK)) - (unsigned)pbase;
-            TRACE("[ %5d - Successfully loaded segment from '%s' @ 0x%08x "
-                  "(0x%08x). p_vaddr=0x%08x p_offset=0x%08x\n", pid, si->name,
-                  (unsigned)pbase, len, phdr->p_vaddr, phdr->p_offset);
-            total_sz += len;
-            /* Make the section writable just in case we'll have to write to
-             * it during relocation (i.e. text segment). However, we will
-             * remember what range of addresses should be write protected.
-             *
-             */
-            if (!(phdr->p_flags & PF_W)) {
-                if ((unsigned)pbase < si->wrprotect_start)
-                    si->wrprotect_start = (unsigned)pbase;
-                if (((unsigned)pbase + len) > si->wrprotect_end)
-                    si->wrprotect_end = (unsigned)pbase + len;
-                mprotect(pbase, len,
-                         PFLAGS_TO_PROT(phdr->p_flags) | PROT_WRITE);
-            }
-        } else if (phdr->p_type == PT_DYNAMIC) {
-            DEBUG_DUMP_PHDR(phdr, "PT_DYNAMIC", pid);
-            /* this segment contains the dynamic linking information */
-            si->dynamic = (unsigned *)(base + phdr->p_vaddr);
-        } else if (phdr->p_type == PT_GNU_RELRO) {
-            if ((phdr->p_vaddr >= si->size)
-                    || ((phdr->p_vaddr + phdr->p_memsz) > si->size)
-                    || ((base + phdr->p_vaddr + phdr->p_memsz) < base)) {
-                DL_ERR("%d invalid GNU_RELRO in '%s' "
-                       "p_vaddr=0x%08x p_memsz=0x%08x", pid, si->name,
-                       phdr->p_vaddr, phdr->p_memsz);
-                goto fail;
-            }
-            si->gnu_relro_start = (Elf32_Addr) (base + phdr->p_vaddr);
-            si->gnu_relro_len = (unsigned) phdr->p_memsz;
-        } else {
-#ifdef ANDROID_ARM_LINKER
-            if (phdr->p_type == PT_ARM_EXIDX) {
-                DEBUG_DUMP_PHDR(phdr, "PT_ARM_EXIDX", pid);
-                /* exidx entries (used for stack unwinding) are 8 bytes each.
-                 */
-                si->ARM_exidx = (unsigned *)phdr->p_vaddr;
-                si->ARM_exidx_count = phdr->p_memsz / 8;
-            }
-#endif
-        }
-
-    }
-
-    /* Sanity check */
-    if (total_sz > si->size) {
-        DL_ERR("%5d - Total length (0x%08x) of mapped segments from '%s' is "
-              "greater than what was allocated (0x%08x). THIS IS BAD!",
-              pid, total_sz, si->name, si->size);
-        goto fail;
-    }
-
-    TRACE("[ %5d - Finish loading segments for '%s' @ 0x%08x. "
-          "Total memory footprint: 0x%08x bytes ]\n", pid, si->name,
-          (unsigned)si->base, si->size);
-    return 0;
-
-fail:
-    /* We can just blindly unmap the entire region even though some things
-     * were mapped in originally with anonymous and others could have been
-     * been mapped in from the file before we failed. The kernel will unmap
-     * all the pages in the range, irrespective of how they got there.
-     */
-    munmap((void *)si->base, si->size);
-    si->flags |= FLAG_ERROR;
-    return -1;
-}
-
-/* TODO: Implement this to take care of the fact that Android ARM
- * ELF objects shove everything into a single loadable segment that has the
- * write bit set. wr_offset is then used to set non-(data|bss) pages to be
- * non-writable.
- */
-#if 0
-static unsigned
-get_wr_offset(int fd, const char *name, Elf32_Ehdr *ehdr)
-{
-    Elf32_Shdr *shdr_start;
-    Elf32_Shdr *shdr;
-    int shdr_sz = ehdr->e_shnum * sizeof(Elf32_Shdr);
-    int cnt;
-    unsigned wr_offset = 0xffffffff;
-
-    shdr_start = mmap(0, shdr_sz, PROT_READ, MAP_PRIVATE, fd,
-                      ehdr->e_shoff & (~PAGE_MASK));
-    if (shdr_start == MAP_FAILED) {
-        WARN("%5d - Could not read section header info from '%s'. Will not "
-             "not be able to determine write-protect offset.\n", pid, name);
-        return (unsigned)-1;
-    }
-
-    for(cnt = 0, shdr = shdr_start; cnt < ehdr->e_shnum; ++cnt, ++shdr) {
-        if ((shdr->sh_type != SHT_NULL) && (shdr->sh_flags & SHF_WRITE) &&
-            (shdr->sh_addr < wr_offset)) {
-            wr_offset = shdr->sh_addr;
-        }
-    }
-
-    munmap(shdr_start, shdr_sz);
-    return wr_offset;
-}
-#endif
-
-static soinfo *
-load_library(const char *name)
-{
-    int fd = open_library(name);
-    int cnt;
-    unsigned ext_sz;
-    unsigned req_base;
-    const char *bname;
-    soinfo *si = NULL;
-    Elf32_Ehdr *hdr;
-
-    if(fd == -1) {
-        DL_ERR("Library '%s' not found", name);
-        return NULL;
-    }
-
-    /* We have to read the ELF header to figure out what to do with this image
-     */
-    if (lseek(fd, 0, SEEK_SET) < 0) {
-        DL_ERR("lseek() failed!");
-        goto fail;
-    }
-
-    if ((cnt = read(fd, &__header[0], PAGE_SIZE)) < 0) {
-        DL_ERR("read() failed!");
-        goto fail;
-    }
-
-    /* Parse the ELF header and get the size of the memory footprint for
-     * the library */
-    req_base = get_lib_extents(fd, name, &__header[0], &ext_sz);
-    if (req_base == (unsigned)-1)
-        goto fail;
     TRACE("[ %5d - '%s' (%s) wants base=0x%08x sz=0x%08x ]\n", pid, name,
           (req_base ? "prelinked" : "not pre-linked"), req_base, ext_sz);
 
@@ -1120,40 +776,76 @@
      * soinfo struct here is a lot more convenient.
      */
     bname = strrchr(name, '/');
-    si = alloc_info(bname ? bname + 1 : name);
+    si = soinfo_alloc(bname ? bname + 1 : name);
     if (si == NULL)
         goto fail;
 
-    /* Carve out a chunk of memory where we will map in the individual
-     * segments */
-    si->base = req_base;
-    si->size = ext_sz;
-    si->flags = 0;
-    si->entry = 0;
-    si->dynamic = (unsigned *)-1;
-    if (alloc_mem_region(si) < 0)
-        goto fail;
-
-    TRACE("[ %5d allocated memory for %s @ %p (0x%08x) ]\n",
-          pid, name, (void *)si->base, (unsigned) ext_sz);
-
-    /* Now actually load the library's segments into right places in memory */
-    if (load_segments(fd, &__header[0], si) < 0) {
+    /* Reserve address space for all loadable segments */
+    ret = phdr_table_reserve_memory(phdr_table,
+                                    phdr_count,
+                                    req_base,
+                                    &load_start,
+                                    &load_size,
+                                    &load_bias);
+    if (ret < 0) {
+        DL_ERR("%5d Can't reserve %d bytes from 0x%08x in address space for %s: %s",
+               pid, ext_sz, req_base, name, strerror(errno));
         goto fail;
     }
 
-    /* this might not be right. Technically, we don't even need this info
-     * once we go through 'load_segments'. */
-    hdr = (Elf32_Ehdr *)si->base;
-    si->phdr = (Elf32_Phdr *)((unsigned char *)si->base + hdr->e_phoff);
-    si->phnum = hdr->e_phnum;
-    /**/
+    TRACE("[ %5d allocated memory for %s @ %p (0x%08x) ]\n",
+          pid, name, load_start, load_size);
 
+    /* Map all the segments in our address space with default protections */
+    ret = phdr_table_load_segments(phdr_table,
+                                   phdr_count,
+                                   load_start,
+                                   load_size,
+                                   load_bias,
+                                   fd);
+    if (ret < 0) {
+        DL_ERR("%5d Can't map loadable segments for %s: %s",
+               pid, name, strerror(errno));
+        goto fail;
+    }
+
+    /* Unprotect the segments, i.e. make them writable, to allow
+     * relocations to work properly. We will later call
+     * phdr_table_protect_segments() after all of them are applied
+     * and all constructors are run.
+     */
+    ret = phdr_table_unprotect_segments(phdr_table,
+                                        phdr_count,
+                                        load_bias);
+    if (ret < 0) {
+        DL_ERR("%5d Can't unprotect loadable segments for %s: %s",
+               pid, name, strerror(errno));
+        goto fail;
+    }
+
+    si->base = (Elf32_Addr) load_start;
+    si->size = load_size;
+    si->load_bias = load_bias;
+    si->flags = 0;
+    si->entry = 0;
+    si->dynamic = (unsigned *)-1;
+    si->phnum = phdr_count;
+    si->phdr = phdr_table_get_loaded_phdr(phdr_table, phdr_count, load_bias);
+    if (si->phdr == NULL) {
+        DL_ERR("%5d Can't find loaded PHDR for %s",
+               pid, name);
+        goto fail;
+    }
+
+    phdr_table_unload(phdr_mmap, phdr_size);
     close(fd);
     return si;
 
 fail:
-    if (si) free_info(si);
+    if (si) soinfo_free(si);
+    if (phdr_mmap != NULL) {
+        phdr_table_unload(phdr_mmap, phdr_size);
+    }
     close(fd);
     return NULL;
 }
@@ -1168,7 +860,7 @@
     TRACE("[ %5d init_library base=0x%08x sz=0x%08x name='%s') ]\n",
           pid, si->base, si->size, si->name);
 
-    if(link_image(si, wr_offset)) {
+    if(soinfo_link_image(si, wr_offset)) {
             /* We failed to link.  However, we can only restore libbase
             ** if no additional libraries have moved it since we updated it.
             */
@@ -1219,7 +911,7 @@
  *   for non-prelinked libraries, find a way to decrement libbase
  */
 static void call_destructors(soinfo *si);
-unsigned unload_library(soinfo *si)
+unsigned soinfo_unload(soinfo *si)
 {
     unsigned *d;
     if (si->refcount == 1) {
@@ -1228,16 +920,13 @@
 
         /*
          * Make sure that we undo the PT_GNU_RELRO protections we added
-         * in link_image. This is needed to undo the DT_NEEDED hack below.
+         * in soinfo_link_image. This is needed to undo the DT_NEEDED hack below.
          */
-        if ((si->gnu_relro_start != 0) && (si->gnu_relro_len != 0)) {
-            Elf32_Addr start = (si->gnu_relro_start & ~PAGE_MASK);
-            unsigned len = (si->gnu_relro_start - start) + si->gnu_relro_len;
-            if (mprotect((void *) start, len, PROT_READ | PROT_WRITE) < 0)
-                DL_ERR("%5d %s: could not undo GNU_RELRO protections. "
-                       "Expect a crash soon. errno=%d (%s)",
-                       pid, si->name, errno, strerror(errno));
-
+        if (phdr_table_unprotect_gnu_relro(si->phdr, si->phnum,
+                                           si->load_bias) < 0) {
+            DL_ERR("%5d %s: could not undo GNU_RELRO protections. "
+                    "Expect a crash soon. errno=%d (%s)",
+                    pid, si->name, errno, strerror(errno));
         }
 
         for(d = si->dynamic; *d; d += 2) {
@@ -1246,13 +935,13 @@
 
                 // The next line will segfault if the we don't undo the
                 // PT_GNU_RELRO protections (see comments above and in
-                // link_image().
+                // soinfo_link_image().
                 d[1] = 0;
 
                 if (validate_soinfo(lsi)) {
                     TRACE("%5d %s needs to unload %s\n", pid,
                           si->name, lsi->name);
-                    unload_library(lsi);
+                    soinfo_unload(lsi);
                 }
                 else
                     DL_ERR("%5d %s: could not unload dependent library",
@@ -1262,7 +951,7 @@
 
         munmap((char *)si->base, si->size);
         notify_gdb_of_unload(si);
-        free_info(si);
+        soinfo_free(si);
         si->refcount = 0;
     }
     else {
@@ -1277,19 +966,20 @@
  * ideal. They should probably be either uint32_t, Elf32_Addr, or unsigned
  * long.
  */
-static int reloc_library(soinfo *si, Elf32_Rel *rel, unsigned count)
+static int soinfo_relocate(soinfo *si, Elf32_Rel *rel, unsigned count)
 {
     Elf32_Sym *symtab = si->symtab;
     const char *strtab = si->strtab;
     Elf32_Sym *s;
     unsigned base;
+    Elf32_Addr offset;
     Elf32_Rel *start = rel;
     unsigned idx;
 
     for (idx = 0; idx < count; ++idx) {
         unsigned type = ELF32_R_TYPE(rel->r_info);
         unsigned sym = ELF32_R_SYM(rel->r_info);
-        unsigned reloc = (unsigned)(rel->r_offset + si->base);
+        unsigned reloc = (unsigned)(rel->r_offset + si->load_bias);
         unsigned sym_addr = 0;
         char *sym_name = NULL;
 
@@ -1297,7 +987,7 @@
               si->name, idx);
         if(sym != 0) {
             sym_name = (char *)(strtab + symtab[sym].st_name);
-            s = _do_lookup(si, sym_name, &base);
+            s = soinfo_do_lookup(si, sym_name, &offset);
             if(s == NULL) {
                 /* We only allow an undefined symbol if this is a weak
                    reference..   */
@@ -1364,7 +1054,7 @@
                 return -1;
             }
 #endif
-                sym_addr = (unsigned)(s->st_value + base);
+                sym_addr = (unsigned)(s->st_value + offset);
 	    }
             COUNT_RELOC(RELOC_SYMBOL);
         } else {
@@ -1516,7 +1206,7 @@
     }
 }
 
-void call_constructors_recursive(soinfo *si)
+void soinfo_call_constructors(soinfo *si)
 {
     if (si->constructors_called)
         return;
@@ -1527,9 +1217,9 @@
     // libc_malloc_debug_leak.so:
     // 1. The program depends on libc, so libc's constructor is called here.
     // 2. The libc constructor calls dlopen() to load libc_malloc_debug_leak.so.
-    // 3. dlopen() calls call_constructors_recursive() with the newly created
+    // 3. dlopen() calls soinfo_call_constructors() with the newly created
     //    soinfo for libc_malloc_debug_leak.so.
-    // 4. The debug so depends on libc, so call_constructors_recursive() is
+    // 4. The debug so depends on libc, so soinfo_call_constructors() is
     //    called again with the libc soinfo. If it doesn't trigger the early-
     //    out above, the libc constructor will be called again (recursively!).
     si->constructors_called = 1;
@@ -1557,7 +1247,7 @@
                     DL_ERR("%5d bad DT_NEEDED pointer in %s",
                            pid, si->name);
                 } else {
-                    call_constructors_recursive(lsi);
+                    soinfo_call_constructors(lsi);
                 }
             }
         }
@@ -1603,7 +1293,7 @@
     int dev_null, i, status;
     int return_value = 0;
 
-    dev_null = open("/dev/null", O_RDWR);
+    dev_null = TEMP_FAILURE_RETRY(open("/dev/null", O_RDWR));
     if (dev_null < 0) {
         DL_ERR("Cannot open /dev/null.");
         return -1;
@@ -1666,120 +1356,69 @@
     return return_value;
 }
 
-static int link_image(soinfo *si, unsigned wr_offset)
+static int soinfo_link_image(soinfo *si, unsigned wr_offset)
 {
     unsigned *d;
-    Elf32_Phdr *phdr = si->phdr;
+    /* "base" might wrap around UINT32_MAX. */
+    Elf32_Addr base = si->load_bias;
+    const Elf32_Phdr *phdr = si->phdr;
     int phnum = si->phnum;
+    int relocating_linker = (si->flags & FLAG_LINKER) != 0;
 
-    INFO("[ %5d linking %s ]\n", pid, si->name);
-    DEBUG("%5d si->base = 0x%08x si->flags = 0x%08x\n", pid,
-          si->base, si->flags);
+    /* We can't debug anything until the linker is relocated */
+    if (!relocating_linker) {
+        INFO("[ %5d linking %s ]\n", pid, si->name);
+        DEBUG("%5d si->base = 0x%08x si->flags = 0x%08x\n", pid,
+            si->base, si->flags);
+    }
 
-    if (si->flags & (FLAG_EXE | FLAG_LINKER)) {
-        /* Locate the needed program segments (DYNAMIC/ARM_EXIDX) for
-         * linkage info if this is the executable or the linker itself. 
-         * If this was a dynamic lib, that would have been done at load time.
-         *
-         * TODO: It's unfortunate that small pieces of this are
-         * repeated from the load_library routine. Refactor this just
-         * slightly to reuse these bits.
-         */
-        si->size = 0;
-        for(; phnum > 0; --phnum, ++phdr) {
-#ifdef ANDROID_ARM_LINKER
-            if(phdr->p_type == PT_ARM_EXIDX) {
-                /* exidx entries (used for stack unwinding) are 8 bytes each.
-                 */
-                si->ARM_exidx = (unsigned *)phdr->p_vaddr;
-                si->ARM_exidx_count = phdr->p_memsz / 8;
-            }
-#endif
-            if (phdr->p_type == PT_LOAD) {
-                /* For the executable, we use the si->size field only in
-                   dl_unwind_find_exidx(), so the meaning of si->size
-                   is not the size of the executable; it is the distance
-                   between the load location of the executable and the last
-                   address of the loadable part of the executable.
-                   We use the range [si->base, si->base + si->size) to
-                   determine whether a PC value falls within the executable
-                   section. Of course, if a value is between si->base and
-                   (si->base + phdr->p_vaddr), it's not in the executable
-                   section, but a) we shouldn't be asking for such a value
-                   anyway, and b) if we have to provide an EXIDX for such a
-                   value, then the executable's EXIDX is probably the better
-                   choice.
-                */
-                DEBUG_DUMP_PHDR(phdr, "PT_LOAD", pid);
-                if (phdr->p_vaddr + phdr->p_memsz > si->size)
-                    si->size = phdr->p_vaddr + phdr->p_memsz;
-                /* try to remember what range of addresses should be write
-                 * protected */
-                if (!(phdr->p_flags & PF_W)) {
-                    unsigned _end;
-
-                    if (si->base + phdr->p_vaddr < si->wrprotect_start)
-                        si->wrprotect_start = si->base + phdr->p_vaddr;
-                    _end = (((si->base + phdr->p_vaddr + phdr->p_memsz + PAGE_SIZE - 1) &
-                             (~PAGE_MASK)));
-                    if (_end > si->wrprotect_end)
-                        si->wrprotect_end = _end;
-                    /* Make the section writable just in case we'll have to
-                     * write to it during relocation (i.e. text segment).
-                     * However, we will remember what range of addresses
-                     * should be write protected.
-                     */
-                    mprotect((void *) (si->base + phdr->p_vaddr),
-                             phdr->p_memsz,
-                             PFLAGS_TO_PROT(phdr->p_flags) | PROT_WRITE);
-                }
-            } else if (phdr->p_type == PT_DYNAMIC) {
-                if (si->dynamic != (unsigned *)-1) {
-                    DL_ERR("%5d multiple PT_DYNAMIC segments found in '%s'. "
-                          "Segment at 0x%08x, previously one found at 0x%08x",
-                          pid, si->name, si->base + phdr->p_vaddr,
-                          (unsigned)si->dynamic);
-                    goto fail;
-                }
-                DEBUG_DUMP_PHDR(phdr, "PT_DYNAMIC", pid);
-                si->dynamic = (unsigned *) (si->base + phdr->p_vaddr);
-            } else if (phdr->p_type == PT_GNU_RELRO) {
-                if ((phdr->p_vaddr >= si->size)
-                        || ((phdr->p_vaddr + phdr->p_memsz) > si->size)
-                        || ((si->base + phdr->p_vaddr + phdr->p_memsz) < si->base)) {
-                    DL_ERR("%d invalid GNU_RELRO in '%s' "
-                           "p_vaddr=0x%08x p_memsz=0x%08x", pid, si->name,
-                           phdr->p_vaddr, phdr->p_memsz);
-                    goto fail;
-                }
-                si->gnu_relro_start = (Elf32_Addr) (si->base + phdr->p_vaddr);
-                si->gnu_relro_len = (unsigned) phdr->p_memsz;
-            }
+    /* Extract dynamic section */
+    si->dynamic = phdr_table_get_dynamic_section(phdr, phnum, base);
+    if (si->dynamic == NULL) {
+        if (!relocating_linker) {
+            DL_ERR("%5d missing PT_DYNAMIC?!", pid);
+        }
+        goto fail;
+    } else {
+        if (!relocating_linker) {
+            DEBUG("%5d dynamic = %p\n", pid, si->dynamic);
         }
     }
 
-    if (si->dynamic == (unsigned *)-1) {
-        DL_ERR("%5d missing PT_DYNAMIC?!", pid);
-        goto fail;
-    }
+#ifdef ANDROID_ARM_LINKER
+    (void) phdr_table_get_arm_exidx(phdr, phnum, base,
+                                    &si->ARM_exidx, &si->ARM_exidx_count);
+#endif
 
-    DEBUG("%5d dynamic = %p\n", pid, si->dynamic);
+    if (si->flags & (FLAG_EXE | FLAG_LINKER)) {
+        if (phdr_table_unprotect_segments(si->phdr,
+                                          si->phnum,
+                                          si->load_bias) < 0) {
+            /* We can't call DL_ERR if the linker's relocations haven't
+             * been performed yet */
+            if (!relocating_linker) {
+                DL_ERR("%5d Can't unprotect segments for %s: %s",
+                       pid, si->name, strerror(errno));
+            }
+            goto fail;
+        }
+    }
 
     /* extract useful information from dynamic section */
     for(d = si->dynamic; *d; d++){
         DEBUG("%5d d = %p, d[0] = 0x%08x d[1] = 0x%08x\n", pid, d, d[0], d[1]);
         switch(*d++){
         case DT_HASH:
-            si->nbucket = ((unsigned *) (si->base + *d))[0];
-            si->nchain = ((unsigned *) (si->base + *d))[1];
-            si->bucket = (unsigned *) (si->base + *d + 8);
-            si->chain = (unsigned *) (si->base + *d + 8 + si->nbucket * 4);
+            si->nbucket = ((unsigned *) (base + *d))[0];
+            si->nchain = ((unsigned *) (base + *d))[1];
+            si->bucket = (unsigned *) (base + *d + 8);
+            si->chain = (unsigned *) (base + *d + 8 + si->nbucket * 4);
             break;
         case DT_STRTAB:
-            si->strtab = (const char *) (si->base + *d);
+            si->strtab = (const char *) (base + *d);
             break;
         case DT_SYMTAB:
-            si->symtab = (Elf32_Sym *) (si->base + *d);
+            si->symtab = (Elf32_Sym *) (base + *d);
             break;
         case DT_PLTREL:
             if(*d != DT_REL) {
@@ -1788,20 +1427,20 @@
             }
             break;
         case DT_JMPREL:
-            si->plt_rel = (Elf32_Rel*) (si->base + *d);
+            si->plt_rel = (Elf32_Rel*) (base + *d);
             break;
         case DT_PLTRELSZ:
             si->plt_rel_count = *d / 8;
             break;
         case DT_REL:
-            si->rel = (Elf32_Rel*) (si->base + *d);
+            si->rel = (Elf32_Rel*) (base + *d);
             break;
         case DT_RELSZ:
             si->rel_count = *d / 8;
             break;
         case DT_PLTGOT:
             /* Save this in case we decide to do lazy binding. We don't yet. */
-            si->plt_got = (unsigned *)(si->base + *d);
+            si->plt_got = (unsigned *)(base + *d);
             break;
         case DT_DEBUG:
             // Set the DT_DEBUG entry to the addres of _r_debug for GDB
@@ -1811,17 +1450,17 @@
             DL_ERR("%5d DT_RELA not supported", pid);
             goto fail;
         case DT_INIT:
-            si->init_func = (void (*)(void))(si->base + *d);
+            si->init_func = (void (*)(void))(base + *d);
             DEBUG("%5d %s constructors (init func) found at %p\n",
                   pid, si->name, si->init_func);
             break;
         case DT_FINI:
-            si->fini_func = (void (*)(void))(si->base + *d);
+            si->fini_func = (void (*)(void))(base + *d);
             DEBUG("%5d %s destructors (fini func) found at %p\n",
                   pid, si->name, si->fini_func);
             break;
         case DT_INIT_ARRAY:
-            si->init_array = (unsigned *)(si->base + *d);
+            si->init_array = (unsigned *)(base + *d);
             DEBUG("%5d %s constructors (init_array) found at %p\n",
                   pid, si->name, si->init_array);
             break;
@@ -1829,7 +1468,7 @@
             si->init_array_count = ((unsigned)*d) / sizeof(Elf32_Addr);
             break;
         case DT_FINI_ARRAY:
-            si->fini_array = (unsigned *)(si->base + *d);
+            si->fini_array = (unsigned *)(base + *d);
             DEBUG("%5d %s destructors (fini_array) found at %p\n",
                   pid, si->name, si->fini_array);
             break;
@@ -1837,7 +1476,7 @@
             si->fini_array_count = ((unsigned)*d) / sizeof(Elf32_Addr);
             break;
         case DT_PREINIT_ARRAY:
-            si->preinit_array = (unsigned *)(si->base + *d);
+            si->preinit_array = (unsigned *)(base + *d);
             DEBUG("%5d %s constructors (preinit_array) found at %p\n",
                   pid, si->name, si->preinit_array);
             break;
@@ -1905,52 +1544,31 @@
 
     if(si->plt_rel) {
         DEBUG("[ %5d relocating %s plt ]\n", pid, si->name );
-        if(reloc_library(si, si->plt_rel, si->plt_rel_count))
+        if(soinfo_relocate(si, si->plt_rel, si->plt_rel_count))
             goto fail;
     }
     if(si->rel) {
         DEBUG("[ %5d relocating %s ]\n", pid, si->name );
-        if(reloc_library(si, si->rel, si->rel_count))
+        if(soinfo_relocate(si, si->rel, si->rel_count))
             goto fail;
     }
 
     si->flags |= FLAG_LINKED;
     DEBUG("[ %5d finished linking %s ]\n", pid, si->name);
 
-#if 0
-    /* This is the way that the old dynamic linker did protection of
-     * non-writable areas. It would scan section headers and find where
-     * .text ended (rather where .data/.bss began) and assume that this is
-     * the upper range of the non-writable area. This is too coarse,
-     * and is kept here for reference until we fully move away from single
-     * segment elf objects. See the code in get_wr_offset (also #if'd 0)
-     * that made this possible.
-     */
-    if(wr_offset < 0xffffffff){
-        mprotect((void*) si->base, wr_offset, PROT_READ | PROT_EXEC);
+    /* All relocations are done, we can protect our segments back to
+     * read-only. */
+    if (phdr_table_protect_segments(si->phdr, si->phnum, si->load_bias) < 0) {
+        DL_ERR("%5d Can't protect segments for %s: %s",
+               pid, si->name, strerror(errno));
+        goto fail;
     }
-#else
-    /* TODO: Verify that this does the right thing in all cases, as it
-     * presently probably does not. It is possible that an ELF image will
-     * come with multiple read-only segments. What we ought to do is scan
-     * the program headers again and mprotect all the read-only segments.
-     * To prevent re-scanning the program header, we would have to build a
-     * list of loadable segments in si, and then scan that instead. */
-    if (si->wrprotect_start != 0xffffffff && si->wrprotect_end != 0) {
-        mprotect((void *)si->wrprotect_start,
-                 si->wrprotect_end - si->wrprotect_start,
-                 PROT_READ | PROT_EXEC);
-    }
-#endif
 
-    if (si->gnu_relro_start != 0 && si->gnu_relro_len != 0) {
-        Elf32_Addr start = (si->gnu_relro_start & ~PAGE_MASK);
-        unsigned len = (si->gnu_relro_start - start) + si->gnu_relro_len;
-        if (mprotect((void *) start, len, PROT_READ) < 0) {
-            DL_ERR("%5d GNU_RELRO mprotect of library '%s' failed: %d (%s)\n",
-                   pid, si->name, errno, strerror(errno));
-            goto fail;
-        }
+    /* We can also turn on GNU RELRO protection */
+    if (phdr_table_protect_gnu_relro(si->phdr, si->phnum, si->load_bias) < 0) {
+        DL_ERR("%5d Can't enable GNU RELRO protection for %s: %s",
+               pid, si->name, strerror(errno));
+        goto fail;
     }
 
     /* If this is a SET?ID program, dup /dev/null to opened stdin,
@@ -2095,7 +1713,7 @@
     INFO("[ android linker & debugger ]\n");
     DEBUG("%5d elfdata @ 0x%08x\n", pid, (unsigned)elfdata);
 
-    si = alloc_info(argv[0]);
+    si = soinfo_alloc(argv[0]);
     if(si == 0) {
         exit(-1);
     }
@@ -2115,7 +1733,7 @@
         /* gdb expects the linker to be in the debug shared object list,
          * and we need to make sure that the reported load address is zero.
          * Without this, gdb gets the wrong idea of where rtld_db_dlactivity()
-         * is.  Don't use alloc_info(), because the linker shouldn't
+         * is.  Don't use soinfo_alloc(), because the linker shouldn't
          * be on the soinfo list.
          */
     strlcpy((char*) linker_soinfo.name, "/system/bin/linker", sizeof linker_soinfo.name);
@@ -2145,18 +1763,17 @@
      */
     int nn;
     si->base = 0;
+    si->size = phdr_table_get_load_size(si->phdr, si->phnum);
+    si->load_bias = 0;
     for ( nn = 0; nn < si->phnum; nn++ ) {
         if (si->phdr[nn].p_type == PT_PHDR) {
-            si->base = (Elf32_Addr) si->phdr - si->phdr[nn].p_vaddr;
+            si->load_bias = (Elf32_Addr)si->phdr - si->phdr[nn].p_vaddr;
+            si->base = (Elf32_Addr) si->phdr - si->phdr[nn].p_offset;
             break;
         }
     }
     si->dynamic = (unsigned *)-1;
-    si->wrprotect_start = 0xffffffff;
-    si->wrprotect_end = 0;
     si->refcount = 1;
-    si->gnu_relro_start = 0;
-    si->gnu_relro_len = 0;
 
         /* Use LD_LIBRARY_PATH if we aren't setuid/setgid */
     if (ldpath_env)
@@ -2166,14 +1783,14 @@
         parse_preloads(ldpreload_env, " :");
     }
 
-    if(link_image(si, 0)) {
+    if(soinfo_link_image(si, 0)) {
         char errmsg[] = "CANNOT LINK EXECUTABLE\n";
         write(2, __linker_dl_err_buf, strlen(__linker_dl_err_buf));
         write(2, errmsg, sizeof(errmsg));
         exit(-1);
     }
 
-    call_constructors_recursive(si);
+    soinfo_call_constructors(si);
 
 #if ALLOW_SYMBOLS_FROM_MAIN
     /* Set somain after we've loaded all the libraries in order to prevent
@@ -2249,6 +1866,32 @@
     return 0; // should never happen
 }
 
+/* Compute the load-bias of an existing executable. This shall only
+ * be used to compute the load bias of an executable or shared library
+ * that was loaded by the kernel itself.
+ *
+ * Input:
+ *    elf    -> address of ELF header, assumed to be at the start of the file.
+ * Return:
+ *    load bias, i.e. add the value of any p_vaddr in the file to get
+ *    the corresponding address in memory.
+ */
+static Elf32_Addr
+get_elf_exec_load_bias(const Elf32_Ehdr* elf)
+{
+    Elf32_Addr        offset     = elf->e_phoff;
+    const Elf32_Phdr* phdr_table = (const Elf32_Phdr*)((char*)elf + offset);
+    const Elf32_Phdr* phdr_end   = phdr_table + elf->e_phnum;
+    const Elf32_Phdr* phdr;
+
+    for (phdr = phdr_table; phdr < phdr_end; phdr++) {
+        if (phdr->p_type == PT_LOAD) {
+            return (Elf32_Addr)elf + phdr->p_offset - phdr->p_vaddr;
+        }
+    }
+    return 0;
+}
+
 /*
  * This is the entry point for the linker, called from begin.S. This
  * method is responsible for fixing the linker's own relocations, and
@@ -2268,16 +1911,14 @@
     memset(&linker_so, 0, sizeof(soinfo));
 
     linker_so.base = linker_addr;
+    linker_so.size = phdr_table_get_load_size(phdr, elf_hdr->e_phnum);
+    linker_so.load_bias = get_elf_exec_load_bias(elf_hdr);
     linker_so.dynamic = (unsigned *) -1;
     linker_so.phdr = phdr;
     linker_so.phnum = elf_hdr->e_phnum;
     linker_so.flags |= FLAG_LINKER;
-    linker_so.wrprotect_start = 0xffffffff;
-    linker_so.wrprotect_end = 0;
-    linker_so.gnu_relro_start = 0;
-    linker_so.gnu_relro_len = 0;
 
-    if (link_image(&linker_so, 0)) {
+    if (soinfo_link_image(&linker_so, 0)) {
         // It would be nice to print an error message, but if the linker
         // can't link itself, there's no guarantee that we'll be able to
         // call write() (because it involves a GOT reference).
diff --git a/linker/linker.h b/linker/linker.h
index 0c986cd..0956ac5 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -37,7 +37,23 @@
 #undef PAGE_MASK
 #undef PAGE_SIZE
 #define PAGE_SIZE 4096
-#define PAGE_MASK 4095
+#define PAGE_MASK (PAGE_SIZE-1)
+
+/* Convenience macros to make page address/offset computations more explicit */
+
+/* Returns the address of the page starting at address 'x' */
+#define PAGE_START(x)  ((x) & ~PAGE_MASK)
+
+/* Returns the offset of address 'x' in its memory page, i.e. this is the
+ * same than 'x' - PAGE_START(x) */
+#define PAGE_OFFSET(x) ((x) & PAGE_MASK)
+
+/* Returns the address of the next page after address 'x', unless 'x' is
+ * itself at the start of a page. Equivalent to:
+ *
+ *  (x == PAGE_START(x)) ? x : PAGE_START(x)+PAGE_SIZE
+ */
+#define PAGE_END(x)    PAGE_START((x) + (PAGE_SIZE-1))
 
 void debugger_init();
 const char *addr_to_name(unsigned addr);
@@ -91,7 +107,7 @@
 struct soinfo
 {
     const char name[SOINFO_NAME_LEN];
-    Elf32_Phdr *phdr;
+    const Elf32_Phdr *phdr;
     int phnum;
     unsigned entry;
     unsigned base;
@@ -101,8 +117,8 @@
 
     unsigned *dynamic;
 
-    unsigned wrprotect_start;
-    unsigned wrprotect_end;
+    unsigned unused2; // DO NOT USE, maintained for compatibility
+    unsigned unused3; // DO NOT USE, maintained for compatibility
 
     soinfo *next;
     unsigned flags;
@@ -145,9 +161,9 @@
 
     int constructors_called;
 
-    Elf32_Addr gnu_relro_start;
-    unsigned gnu_relro_len;
-
+    /* When you read a virtual address from the ELF file, add this
+     * value to get the corresponding address in the process' address space */
+    Elf32_Addr load_bias;
 };
 
 
@@ -202,13 +218,14 @@
 #endif
 
 soinfo *find_library(const char *name);
-unsigned unload_library(soinfo *si);
-Elf32_Sym *lookup_in_library(soinfo *si, const char *name);
 Elf32_Sym *lookup(const char *name, soinfo **found, soinfo *start);
 soinfo *find_containing_library(const void *addr);
-Elf32_Sym *find_containing_symbol(const void *addr, soinfo *si);
 const char *linker_get_error(void);
-void call_constructors_recursive(soinfo *si);
+
+unsigned soinfo_unload(soinfo *si);
+Elf32_Sym *soinfo_find_symbol(soinfo* si, const void *addr);
+Elf32_Sym *soinfo_lookup(soinfo *si, const char *name);
+void soinfo_call_constructors(soinfo *si);
 
 #ifdef ANDROID_ARM_LINKER 
 typedef long unsigned int *_Unwind_Ptr;
diff --git a/linker/linker_environ.c b/linker/linker_environ.c
index b71dd80..fadcb60 100644
--- a/linker/linker_environ.c
+++ b/linker/linker_environ.c
@@ -192,13 +192,11 @@
         "TZDIR",
         "LD_AOUT_LIBRARY_PATH",
         "LD_AOUT_PRELOAD",
+        NULL
     };
 
-    const char* const* cp   = unsec_vars;
-    const char* const* endp = cp + sizeof(unsec_vars)/sizeof(unsec_vars[0]);
-
-    while (cp < endp) {
-        linker_env_unset(*cp);
-        cp++;
+    int count;
+    for (count = 0; unsec_vars[count] != NULL; count++) {
+        linker_env_unset(unsec_vars[count]);
     }
 }
diff --git a/linker/linker_format.c b/linker/linker_format.c
index 0c68a0b..cded68a 100644
--- a/linker/linker_format.c
+++ b/linker/linker_format.c
@@ -172,6 +172,21 @@
     return format_buffer(buff, bufsize, format, args);
 }
 
+/* The pthread implementation uses snprintf(). If we define it here, we
+ * avoid pulling the stdio vfprintf() implementation into the linker
+ * saving about 19KB of machine code.
+ */
+int
+snprintf(char* buff, size_t bufsize, const char* format, ...)
+{
+    va_list args;
+    int ret;
+    va_start(args, format);
+    ret = vsnprintf(buff, bufsize, format, args);
+    va_end(args);
+    return ret;
+}
+
 #if LINKER_DEBUG
 
 #if !LINKER_DEBUG_TO_LOG
diff --git a/linker/linker_phdr.c b/linker/linker_phdr.c
new file mode 100644
index 0000000..c9f194b
--- /dev/null
+++ b/linker/linker_phdr.c
@@ -0,0 +1,665 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <sys/mman.h>
+
+#include "linker_phdr.h"
+
+/**
+  TECHNICAL NOTE ON ELF LOADING.
+
+  An ELF file's program header table contains one or more PT_LOAD
+  segments, which corresponds to portions of the file that need to
+  be mapped into the process' address space.
+
+  Each loadable segment has the following important properties:
+
+    p_offset  -> segment file offset
+    p_filesz  -> segment file size
+    p_memsz   -> segment memory size (always >= p_filesz)
+    p_vaddr   -> segment's virtual address
+    p_flags   -> segment flags (e.g. readable, writable, executable)
+
+  We will ignore the p_paddr and p_align fields of Elf32_Phdr for now.
+
+  The loadable segments can be seen as a list of [p_vaddr ... p_vaddr+p_memsz)
+  ranges of virtual addresses. A few rules apply:
+
+  - the virtual address ranges should not overlap.
+
+  - if a segment's p_filesz is smaller than its p_memsz, the extra bytes
+    between them should always be initialized to 0.
+
+  - ranges do not necessarily start or end at page boundaries. Two distinct
+    segments can have their start and end on the same page. In this case, the
+    page inherits the mapping flags of the latter segment.
+
+  Finally, the real load addrs of each segment is not p_vaddr. Instead the
+  loader decides where to load the first segment, then will load all others
+  relative to the first one to respect the initial range layout.
+
+  For example, consider the following list:
+
+    [ offset:0,      filesz:0x4000, memsz:0x4000, vaddr:0x30000 ],
+    [ offset:0x4000, filesz:0x2000, memsz:0x8000, vaddr:0x40000 ],
+
+  This corresponds to two segments that cover these virtual address ranges:
+
+       0x30000...0x34000
+       0x40000...0x48000
+
+  If the loader decides to load the first segment at address 0xa0000000
+  then the segments' load address ranges will be:
+
+       0xa0030000...0xa0034000
+       0xa0040000...0xa0048000
+
+  In other words, all segments must be loaded at an address that has the same
+  constant offset from their p_vaddr value. This offset is computed as the
+  difference between the first segment's load address, and its p_vaddr value.
+
+  However, in practice, segments do _not_ start at page boundaries. Since we
+  can only memory-map at page boundaries, this means that the bias is
+  computed as:
+
+       load_bias = phdr0_load_address - PAGE_START(phdr0->p_vaddr)
+
+  (NOTE: The value must be used as a 32-bit unsigned integer, to deal with
+          possible wrap around UINT32_MAX for possible large p_vaddr values).
+
+  And that the phdr0_load_address must start at a page boundary, with
+  the segment's real content starting at:
+
+       phdr0_load_address + PAGE_OFFSET(phdr0->p_vaddr)
+
+  Note that ELF requires the following condition to make the mmap()-ing work:
+
+      PAGE_OFFSET(phdr0->p_vaddr) == PAGE_OFFSET(phdr0->p_offset)
+
+  The load_bias must be added to any p_vaddr value read from the ELF file to
+  determine the corresponding memory address.
+
+ **/
+
+#define MAYBE_MAP_FLAG(x,from,to)    (((x) & (from)) ? (to) : 0)
+#define PFLAGS_TO_PROT(x)            (MAYBE_MAP_FLAG((x), PF_X, PROT_EXEC) | \
+                                      MAYBE_MAP_FLAG((x), PF_R, PROT_READ) | \
+                                      MAYBE_MAP_FLAG((x), PF_W, PROT_WRITE))
+
+/* Load the program header table from an ELF file into a read-only private
+ * anonymous mmap-ed block.
+ *
+ * Input:
+ *   fd           -> file descriptor
+ *   phdr_offset  -> file offset of phdr table
+ *   phdr_num     -> number of entries in the table.
+ *
+ * Output:
+ *   phdr_mmap    -> address of mmap block in memory.
+ *   phdr_memsize -> size of mmap block in memory.
+ *   phdr_table   -> address of first entry in memory.
+ *
+ * Return:
+ *   -1 on error, or 0 on success.
+ */
+int phdr_table_load(int                fd,
+                    Elf32_Addr         phdr_offset,
+                    Elf32_Half         phdr_num,
+                    void**             phdr_mmap,
+                    Elf32_Addr*        phdr_size,
+                    const Elf32_Phdr** phdr_table)
+{
+    Elf32_Addr  page_min, page_max, page_offset;
+    void*       mmap_result;
+
+    /* Just like the kernel, we only accept program header tables that
+     * are smaller than 64KB. */
+    if (phdr_num < 1 || phdr_num > 65536/sizeof(Elf32_Phdr)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    page_min = PAGE_START(phdr_offset);
+    page_max = PAGE_END(phdr_offset + phdr_num*sizeof(Elf32_Phdr));
+    page_offset = PAGE_OFFSET(phdr_offset);
+
+    mmap_result = mmap(NULL,
+                       page_max - page_min,
+                       PROT_READ,
+                       MAP_PRIVATE,
+                       fd,
+                       page_min);
+
+    if (mmap_result == MAP_FAILED) {
+        return -1;
+    }
+
+    *phdr_mmap = mmap_result;
+    *phdr_size = page_max - page_min;
+    *phdr_table = (Elf32_Phdr*)((char*)mmap_result + page_offset);
+
+    return 0;
+}
+
+void phdr_table_unload(void* phdr_mmap, Elf32_Addr phdr_memsize)
+{
+    munmap(phdr_mmap, phdr_memsize);
+}
+
+
+/* Compute the extent of all loadable segments in an ELF program header
+ * table. This corresponds to the page-aligned size in bytes that needs to be
+ * reserved in the process' address space
+ *
+ * This returns 0 if there are no loadable segments.
+ */
+Elf32_Addr phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
+                                    int               phdr_count)
+{
+    int nn;
+
+    Elf32_Addr min_vaddr = 0xFFFFFFFFU;
+    Elf32_Addr max_vaddr = 0x00000000U;
+
+    for (nn = 0; nn < phdr_count; nn++) {
+        const Elf32_Phdr* phdr = &phdr_table[nn];
+
+        if (phdr->p_type != PT_LOAD)
+            continue;
+
+        if (phdr->p_vaddr < min_vaddr)
+            min_vaddr = phdr->p_vaddr;
+
+        if (phdr->p_vaddr + phdr->p_memsz > max_vaddr)
+            max_vaddr = phdr->p_vaddr + phdr->p_memsz;
+    }
+
+    if (min_vaddr > max_vaddr) {
+        return 0;
+    }
+
+    min_vaddr = PAGE_START(min_vaddr);
+    max_vaddr = PAGE_END(max_vaddr);
+
+    return max_vaddr - min_vaddr;
+}
+
+/* Reserve a virtual address range big enough to hold all loadable
+ * segments of a program header table. This is done by creating a
+ * private anonymous mmap() with PROT_NONE.
+ *
+ * Input:
+ *   phdr_table    -> program header table
+ *   phdr_count    -> number of entries in the tables
+ *   required_base -> for prelinked libraries, mandatory load address
+ *                    of the first loadable segment. 0 otherwise.
+ * Output:
+ *   load_start    -> first page of reserved address space range
+ *   load_size     -> size in bytes of reserved address space range
+ *   load_bias     -> load bias, as described in technical note above.
+ *
+ * Return:
+ *   0 on success, -1 otherwise. Error code in errno.
+ */
+int
+phdr_table_reserve_memory(const Elf32_Phdr* phdr_table,
+                          int               phdr_count,
+                          Elf32_Addr        required_base,
+                          void**            load_start,
+                          Elf32_Addr*       load_size,
+                          Elf32_Addr*       load_bias)
+{
+    Elf32_Addr size = phdr_table_get_load_size(phdr_table, phdr_count);
+    void*      start;
+    int        nn, mmap_flags;
+
+    if (size == 0) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
+    if (required_base != 0)
+        mmap_flags |= MAP_FIXED;
+
+    start = mmap((void*)required_base, size, PROT_NONE, mmap_flags, -1, 0);
+    if (start == MAP_FAILED) {
+        return -1;
+    }
+
+    *load_start = start;
+    *load_size  = size;
+    *load_bias  = 0;
+
+    for (nn = 0; nn < phdr_count; nn++) {
+        const Elf32_Phdr* phdr = &phdr_table[nn];
+        if (phdr->p_type == PT_LOAD) {
+            *load_bias = (Elf32_Addr)start - PAGE_START(phdr->p_vaddr);
+            break;
+        }
+    }
+    return 0;
+}
+
+/* Map all loadable segments in process' address space.
+ * This assumes you already called phdr_table_reserve_memory to
+ * reserve the address space range for the library.
+ *
+ * Input:
+ *   phdr_table    -> program header table
+ *   phdr_count    -> number of entries in the table
+ *   load_start    -> start address of reserved memory range.
+ *   load_size     -> size of reserved memory range.
+ *   load_bias     -> load offset.
+ *   fd            -> input file descriptor.
+ *
+ * Return:
+ *   0 on success, -1 otherwise. Error code in errno.
+ */
+int
+phdr_table_load_segments(const Elf32_Phdr* phdr_table,
+                         int               phdr_count,
+                         void*             load_start,
+                         Elf32_Addr        load_size,
+                         Elf32_Addr        load_bias,
+                         int               fd)
+{
+    int nn;
+
+    for (nn = 0; nn < phdr_count; nn++) {
+        const Elf32_Phdr* phdr = &phdr_table[nn];
+        void* seg_addr;
+
+        if (phdr->p_type != PT_LOAD)
+            continue;
+
+        /* Segment addresses in memory */
+        Elf32_Addr seg_start = phdr->p_vaddr + load_bias;
+        Elf32_Addr seg_end   = seg_start + phdr->p_memsz;
+
+        Elf32_Addr seg_page_start = PAGE_START(seg_start);
+        Elf32_Addr seg_page_end   = PAGE_END(seg_end);
+
+        Elf32_Addr seg_file_end   = seg_start + phdr->p_filesz;
+
+        /* File offsets */
+        Elf32_Addr file_start = phdr->p_offset;
+        Elf32_Addr file_end   = file_start + phdr->p_filesz;
+
+        Elf32_Addr file_page_start = PAGE_START(file_start);
+        Elf32_Addr file_page_end   = PAGE_END(file_end);
+
+        seg_addr = mmap((void*)seg_page_start,
+                        file_end - file_page_start,
+                        PFLAGS_TO_PROT(phdr->p_flags),
+                        MAP_FIXED|MAP_PRIVATE,
+                        fd,
+                        file_page_start);
+
+        if (seg_addr == MAP_FAILED) {
+            return -1;
+        }
+
+        /* if the segment is writable, and does not end on a page boundary,
+         * zero-fill it until the page limit. */
+        if ((phdr->p_flags & PF_W) != 0 && PAGE_OFFSET(seg_file_end) > 0) {
+            memset((void*)seg_file_end, 0, PAGE_SIZE - PAGE_OFFSET(seg_file_end));
+        }
+
+        seg_file_end = PAGE_END(seg_file_end);
+
+        /* seg_file_end is now the first page address after the file
+         * content. If seg_end is larger, we need to zero anything
+         * between them. This is done by using a private anonymous
+         * map for all extra pages.
+         */
+        if (seg_page_end > seg_file_end) {
+            void* zeromap = mmap((void*)seg_file_end,
+                                    seg_page_end - seg_file_end,
+                                    PFLAGS_TO_PROT(phdr->p_flags),
+                                    MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE,
+                                    -1,
+                                    0);
+            if (zeromap == MAP_FAILED) {
+                return -1;
+            }
+        }
+    }
+    return 0;
+}
+
+/* Used internally. Used to set the protection bits of all loaded segmments
+ * with optional extra flags (i.e. really PROT_WRITE). Used by
+ * phdr_table_protect_segments and phdr_table_unprotect_segments.
+ */
+static int
+_phdr_table_set_load_prot(const Elf32_Phdr* phdr_table,
+                          int               phdr_count,
+                          Elf32_Addr        load_bias,
+                          int               extra_prot_flags)
+{
+    const Elf32_Phdr* phdr = phdr_table;
+    const Elf32_Phdr* phdr_limit = phdr + phdr_count;
+
+    for (; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type != PT_LOAD || (phdr->p_flags & PF_W) != 0)
+            continue;
+
+        Elf32_Addr seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
+        Elf32_Addr seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+
+        int ret = mprotect((void*)seg_page_start,
+                           seg_page_end - seg_page_start,
+                           PFLAGS_TO_PROT(phdr->p_flags) | extra_prot_flags);
+        if (ret < 0) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+/* Restore the original protection modes for all loadable segments.
+ * You should only call this after phdr_table_unprotect_segments and
+ * applying all relocations.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   0 on error, -1 on failure (error code in errno).
+ */
+int
+phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
+                            int               phdr_count,
+                            Elf32_Addr        load_bias)
+{
+    return _phdr_table_set_load_prot(phdr_table, phdr_count,
+                                      load_bias, 0);
+}
+
+/* Change the protection of all loaded segments in memory to writable.
+ * This is useful before performing relocations. Once completed, you
+ * will have to call phdr_table_protect_segments to restore the original
+ * protection flags on all segments.
+ *
+ * Note that some writable segments can also have their content turned
+ * to read-only by calling phdr_table_protect_gnu_relro. This is no
+ * performed here.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   0 on error, -1 on failure (error code in errno).
+ */
+int
+phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
+                              int               phdr_count,
+                              Elf32_Addr        load_bias)
+{
+    return _phdr_table_set_load_prot(phdr_table, phdr_count,
+                                      load_bias, PROT_WRITE);
+}
+
+/* Used internally by phdr_table_protect_gnu_relro and
+ * phdr_table_unprotect_gnu_relro.
+ */
+static int
+_phdr_table_set_gnu_relro_prot(const Elf32_Phdr* phdr_table,
+                               int               phdr_count,
+                               Elf32_Addr        load_bias,
+                               int               prot_flags)
+{
+    const Elf32_Phdr* phdr = phdr_table;
+    const Elf32_Phdr* phdr_limit = phdr + phdr_count;
+
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type != PT_GNU_RELRO)
+            continue;
+
+        /* Tricky: what happens when the relro segment does not start
+         * or end at page boundaries?. We're going to be over-protective
+         * here and put every page touched by the segment as read-only.
+         *
+         * This seems to match Ian Lance Taylor's description of the
+         * feature at http://www.airs.com/blog/archives/189.
+         *
+         * Extract:
+         *    Note that the current dynamic linker code will only work
+         *    correctly if the PT_GNU_RELRO segment starts on a page
+         *    boundary. This is because the dynamic linker rounds the
+         *    p_vaddr field down to the previous page boundary. If
+         *    there is anything on the page which should not be read-only,
+         *    the program is likely to fail at runtime. So in effect the
+         *    linker must only emit a PT_GNU_RELRO segment if it ensures
+         *    that it starts on a page boundary.
+         */
+        Elf32_Addr seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
+        Elf32_Addr seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+
+        int ret = mprotect((void*)seg_page_start,
+                           seg_page_end - seg_page_start,
+                           prot_flags);
+        if (ret < 0) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+/* Apply GNU relro protection if specified by the program header. This will
+ * turn some of the pages of a writable PT_LOAD segment to read-only, as
+ * specified by one or more PT_GNU_RELRO segments. This must be always
+ * performed after relocations.
+ *
+ * NOTE: One must call phdr_table_unprotect_gnu_relro() before calling
+ *        the library's destructors, in order to ensure that the .dynamic
+ *        section is writable (as well as the .data.relro section that
+ *        might contain the content of static constant C++ objects that
+ *        needs to be destroyed).
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   0 on error, -1 on failure (error code in errno).
+ */
+int
+phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
+                             int               phdr_count,
+                             Elf32_Addr        load_bias)
+{
+    return _phdr_table_set_gnu_relro_prot(phdr_table,
+                                          phdr_count,
+                                          load_bias,
+                                          PROT_READ);
+}
+
+/* Un-apply GNU relro protection if specified by the program header.
+ * See comment for phdr_table_protect_gnu_relro.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   0 on error, -1 on failure (error code in errno).
+ */
+int
+phdr_table_unprotect_gnu_relro(const Elf32_Phdr* phdr_table,
+                               int               phdr_count,
+                               Elf32_Addr        load_bias)
+{
+    return _phdr_table_set_gnu_relro_prot(phdr_table,
+                                          phdr_count,
+                                          load_bias,
+                                          PROT_READ|PROT_WRITE);
+}
+
+#ifdef ANDROID_ARM_LINKER
+
+#  ifndef PT_ARM_EXIDX
+#    define PT_ARM_EXIDX    0x70000001      /* .ARM.exidx segment */
+#  endif
+
+/* Return the address and size of the .ARM.exidx section in memory,
+ * if present.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Output:
+ *   arm_exidx       -> address of table in memory (NULL on failure).
+ *   arm_exidx_count -> number of items in table (0 on failure).
+ * Return:
+ *   0 on error, -1 on failure (_no_ error code in errno)
+ */
+int
+phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
+                         int               phdr_count,
+                         Elf32_Addr        load_bias,
+                         Elf32_Addr**      arm_exidx,
+                         unsigned*         arm_exidx_count)
+{
+    const Elf32_Phdr* phdr = phdr_table;
+    const Elf32_Phdr* phdr_limit = phdr + phdr_count;
+
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type != PT_ARM_EXIDX)
+            continue;
+
+        *arm_exidx = (Elf32_Addr*)(load_bias + phdr->p_vaddr);
+        *arm_exidx_count = (unsigned)(phdr->p_memsz / 8);
+        return 0;
+    }
+    *arm_exidx = NULL;
+    *arm_exidx_count = 0;
+    return -1;
+}
+#endif /* ANDROID_ARM_LINKER */
+
+/* Return the address of the ELF file's .dynamic section in memory,
+ * or NULL if missing.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entires in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   0 on error, -1 on failure (_no_ error code in errno)
+ */
+Elf32_Addr*
+phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
+                               int               phdr_count,
+                               Elf32_Addr        load_bias)
+{
+    const Elf32_Phdr* phdr = phdr_table;
+    const Elf32_Phdr* phdr_limit = phdr + phdr_count;
+
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type == PT_DYNAMIC) {
+            return (Elf32_Addr*)(load_bias + phdr->p_vaddr);
+        }
+    }
+    return NULL;
+}
+
+/* Return the address of the program header table as it appears in the loaded
+ * segments in memory. This is in contrast with the input 'phdr_table' which
+ * is temporary and will be released before the library is relocated.
+ *
+ * Input:
+ *   phdr_table  -> program header table
+ *   phdr_count  -> number of entries in tables
+ *   load_bias   -> load bias
+ * Return:
+ *   Address of loaded program header table on success (it has
+ *   'phdr_count' entries), or NULL on failure (no error code).
+ */
+const Elf32_Phdr*
+phdr_table_get_loaded_phdr(const Elf32_Phdr*   phdr_table,
+                           int                 phdr_count,
+                           Elf32_Addr          load_bias)
+{
+    const Elf32_Phdr* phdr = phdr_table;
+    const Elf32_Phdr* phdr_limit = phdr + phdr_count;
+    Elf32_Addr  loaded = 0;
+    Elf32_Addr  loaded_end;
+
+    /* If there is a PT_PHDR, use it directly */
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type == PT_PHDR) {
+            loaded = load_bias + phdr->p_vaddr;
+            goto CHECK;
+        }
+    }
+
+    /* Otherwise, check the first loadable segment. If its file offset
+     * is 0, it starts with the ELF header, and we can trivially find the
+     * loaded program header from it. */
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type == PT_LOAD) {
+            if (phdr->p_offset == 0) {
+                Elf32_Addr  elf_addr = load_bias + phdr->p_vaddr;
+                const Elf32_Ehdr* ehdr = (const Elf32_Ehdr*)(void*)elf_addr;
+                Elf32_Addr  offset = ehdr->e_phoff;
+                loaded = (Elf32_Addr)ehdr + offset;
+                goto CHECK;
+            }
+            break;
+        }
+    }
+
+    /* We didn't find it, let the client know. He may be able to
+     * keep a copy of the input phdr_table instead. */
+    return NULL;
+
+CHECK:
+    /* Ensure that our program header is actually within a loadable
+     * segment. This should help catch badly-formed ELF files that
+     * would cause the linker to crash later when trying to access it.
+     */
+    loaded_end = loaded + phdr_count*sizeof(Elf32_Phdr);
+
+    for (phdr = phdr_table; phdr < phdr_limit; phdr++) {
+        if (phdr->p_type != PT_LOAD)
+            continue;
+        Elf32_Addr seg_start = phdr->p_vaddr + load_bias;
+        Elf32_Addr seg_end   = phdr->p_filesz + seg_start;
+
+        if (seg_start <= loaded && loaded_end <= seg_end) {
+            return (const Elf32_Phdr*)loaded;
+        }
+    }
+    return NULL;
+}
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
new file mode 100644
index 0000000..d542e46
--- /dev/null
+++ b/linker/linker_phdr.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef LINKER_PHDR_H
+#define LINKER_PHDR_H
+
+/* Declarations related to the ELF program header table and segments.
+ *
+ * The design goal is to provide an API that is as close as possible
+ * to the ELF spec, and does not depend on linker-specific data
+ * structures (e.g. the exact layout of struct soinfo).
+ */
+
+#include "linker.h"
+
+/* See linker_phdr.c for all usage documentation */
+
+int
+phdr_table_load(int                fd,
+                Elf32_Addr         phdr_offset,
+                Elf32_Half         phdr_num,
+                void**             phdr_mmap,
+                Elf32_Addr*        phdr_size,
+                const Elf32_Phdr** phdr_table);
+
+void
+phdr_table_unload(void* phdr_mmap, Elf32_Addr phdr_memsize);
+
+Elf32_Addr
+phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
+                         int               phdr_count);
+
+int
+phdr_table_reserve_memory(const Elf32_Phdr* phdr_table,
+                          int               phdr_count,
+                          Elf32_Addr        required_base,
+                          void**            load_start,
+                          Elf32_Addr*       load_size,
+                          Elf32_Addr*       load_bias);
+
+int
+phdr_table_load_segments(const Elf32_Phdr* phdr_table,
+                         int               phdr_count,
+                         void*             load_start,
+                         Elf32_Addr        load_size,
+                         Elf32_Addr        load_bias,
+                         int               fd);
+
+int
+phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
+                            int               phdr_count,
+                            Elf32_Addr        load_bias);
+
+int
+phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
+                              int               phdr_count,
+                              Elf32_Addr        load_bias);
+
+int
+phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
+                             int               phdr_count,
+                             Elf32_Addr        load_bias);
+
+int
+phdr_table_unprotect_gnu_relro(const Elf32_Phdr* phdr_table,
+                               int               phdr_count,
+                               Elf32_Addr        load_bias);
+
+const Elf32_Phdr*
+phdr_table_get_loaded_phdr(const Elf32_Phdr*   phdr_table,
+                           int                 phdr_count,
+                           Elf32_Addr          load_bias);
+
+#ifdef ANDROID_ARM_LINKER
+int
+phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
+                         int               phdr_count,
+                         Elf32_Addr        load_bias,
+                         Elf32_Addr**      arm_exidx,
+                         unsigned*         arm_exidix_count);
+#endif
+
+Elf32_Addr*
+phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
+                               int               phdr_count,
+                               Elf32_Addr        load_bias);
+
+#endif /* LINKER_PHDR_H */